HomeMy WebLinkAbout34-4113-Traffic-Signals_Rev_1Dennis Yarmouth Intermediate Middle School January 19, 2021
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Document 34 4113 Traffic Signals
PART 1 - GENERAL
1.01 GENERAL PROVISIONS
A. Attention is directed to the Contract and General Conditions and all Sections within Division 01
– General Requirements which are hereby made a part of this Section of the Specifications.
B. Examine all other Sections of the Specifications for requirements which affect work of this
Section whether or not such work is specifically mentioned in this Section.
C. Coordinate work with trades affecting, or affected by, work of this Section. Cooperate with such
trades to assure the steady progress of all work under the Contract.
D. Contractor shall register with “Dig Safe” 72 hours prior to construction. It is the Contractor’s
responsibility to maintain “Dig Safe” registrations and “Dig Safe” markings. Contractor shall
comply fully with applicable utility company requirements.
E. Contractor shall obtain a road opening permit, and any other applicable permits, from the Town
of Yarmouth prior to construction.
1.02 SUMMARY
A. Section Includes:
1. Traffic signals for intersection control.
2. Removal and legal disposal of old and installation of new school speed limit sign
assemblies with flashing beacons for a reduced school speed limit zone.
B. Related Sections include the following:
1. Section 02 4113 Utility Line Removal
2. Section 10 1453 Traffic Signage
3. Section 31 0000 Earth Moving
4. Section 31 1000 Site Clearing
5. Section 31 2500 Erosion and Sedimentation Controls
6. Section 31 5000 Excavation Support and Protection
7. Section 31 1216 Asphalt Paving
8. Section 32 1313 Site Concrete
9. Section 32 1723 Pavement Markings
10. Section 32 9240 Seeding
1.03 REFERENCED STANDARDS
A. Massachusetts Department of Transportation (MassDOT), “Standard Specification for Highways
and Bridges.” 2020 Edition, Supplemental Specifications dated June 30, 2020. (“Standard
Specifications”).
B. MassDOT, “Construction Standard Details” October 2017.
C. Commonwealth of Massachusetts Department of Public Works “Standard Drawings for Signs
and Supports” 1990.
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Dennis Yarmouth Regional School District 100% Construction Documents
Perkins Eastman DPC, project #71011 Addendum No. 2, February 12, 2021
34 4113 Traffic Signals
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D. Federal Highway Administration (FHWA), “Manual on Uniform Traffic Control Devices”
(MUTCD) 2009 with Massachusetts Amendments and Standard Municipal Traffic Code,
January 2012.
E. Commonwealth of Massachusetts Department of Public Works, “Standard Drawings for Traffic
Signal and Highway Lighting”, 1968.
F. MassDOT, Highway Division, “Overhead Signal Structure & Foundation Standard Drawings”,
December 2015.
G. American Association of State Highway and Transportation Officials (AASHTO) “Standard
Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals” 2013
with all interim revisions.
1.04 SUBMITTALS
A. Shop Drawings.
1. Mast arms and foundations shop drawings.
2. Bolt circle details.
B. Manufacturer’s catalog cuts for traffic signal equipment and sign assemblies with flashing
beacons.
C. Wiring diagrams of the internal, external and field connections and manuals shall be supplied
for all equipment installed as part of the flashing school speed limit sign assembly system.
Documentation shall involve instructions for set up and troubleshooting of all components in the
system.
D. Within 30 days following execution of this part of the Contract, the Contractor shall submit shop
drawings for signal supports, a list of equipment, catalog cuts, and/or manufacturer's equipment
specifications, as applicable, to the Engineer in accordance with the relevant provisions of
Section 800 of the Standard Specifications. The submission shall include all equipment
identified on the plans or in the specifications by the name of the manufacturer, model or
identifying number, and amount of each item. All equipment shall be listed on MassDOT’s
Qualified Traffic Control Equipment (QTCE) list.
E. The Contractor shall not begin any work until shop drawings and manufacturer's data has been
approved in writing from the Engineer. Approval of these drawings will be general in character
and shall not relieve the Contractor from the responsibility of, or the necessity of, furnishing
materials and workmanship conforming to the plans and specifications.
F. The Contractor shall deliver to the Engineer a certificate of compliance by the manufacturer for
all materials purchased from the manufacturer.
1.05 QUALITY ASSURANCE
A. Manufacturer Qualifications: Traffic signal equipment manufacturers registered with and
approved by authorities having jurisdiction in which Project is located.
B. The warranties that the Contractor receives from each manufacturer of equipment and materials
pertinent to the complete and satisfactory operation of traffic signal installation and sign
assembly with flashing beacon installation shall be turned over to the Town at the time of
acceptance of the project at no additional cost. Each warranty so furnished shall indicate its
expiration date and be in effect for a minimum period of one year from the date traffic signals
and sign assemblies with flashing beacons were placed in continuous operation.
Dennis Yarmouth Intermediate Middle School January 19, 2021
Dennis Yarmouth Regional School District 100% Construction Documents
Perkins Eastman DPC, project #71011 Addendum No. 2, February 12, 2021
34 4113 Traffic Signals
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1. If within one year from the date the traffic signal system is placed on continuous
operation the equipment and materials do not meet the warranties specified above and
the Town notifies the manufacturer or their authorized representative promptly, the
manufacturer or their authorized representative thereupon shall correct any defect either
by repairing or replacing any defective part or parts, at no cost to the Town.
2. The flashing school speed limit sign assemblies shall include a warranty by its supplier
for two (2) years from the date of installation.
C. The Contractor shall, at their own expense, replace any part of the traffic signal control and sign
assemblies with flashing beacons equipment found to be defective in workmanship, material or
manner of functioning within six months from the date of final acceptance of all the installations.
PART 2 - PRODUCTS
2.01 PULL BOX 12 X 12 INCHES – SD2.031
A. Shall conform to the relevant provisions of Section 800 of the Standard Specifications and the
following:
1. The work shall consist of furnishing and installing pull boxes for traffic signal cable in
pavement, sidewalk, and planted areas. All pull boxes proposed in the roadway and
driveways, as applicable, must be installed with a heavy duty frame and cover capable of
sustained loading of H-20 or better in conformance with the Standard Specifications at no
additional cost.
2.02 3-INCH ELECTRICAL CONDUIT TYPE NM PLASTIC (UL)
A. The work under this item shall conform to the relevant provisions of Section 800 of the
Standard Specifications and the following:
1. The work shall include the furnishing and installation of 3-inch non-metallic conduit for
traffic signal systems in accordance with the plans and as directed by the Engineer.
The conduit material shall be Schedule 80 polyvinyl chloride (PVC) plastic conduit.
2.03 GRANITE CURB
A. The work under this item shall conform to the relevant provisions of Section 500 of the Standard
Specifications and the following:
1. This work shall include the furnishing and setting of granite curb type VA4- straight,
curved, and transitions, including curbing for wheelchair ramps, for the installation of
sidewalks and wheelchair ramps along Station Avenue in accordance with the plans and
as directed by the Engineer. The curbing shall be finished as follows:
a. Top surface: saw cut to true planes.
b. Front face: smooth quarry split.
2.04 TRAFFIC SIGNAL EQUIPMENT
A. All work under this item shall conform to the relevant provisions of Section 800 of the Standard
Specification, the 2009 MUTCD, and the following technical provisions.
1. The traffic signal controller unit (CU), malfunction management unit (MMU) and all other
ancillary traffic signal control components included in the traffic control cabinet shall
comply with the National Electrical Manufacturers Association (NEMA) Standard No. TS
2-2016, Traffic Controller Assemblies with National Transportation Communications for
ITS Protocol (NTCIP) Requirements.
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2. The controller unit shall be a keyboard-entry menu-driven unit that conforms to the
Standard Specifications, with internal time base coordination, emergency pre-emption,
and programmatic capability. Controllers shall conform to Section 3, Controller Units of
NEMA No. TS 2, Traffic Controller Assemblies. The controller unit shall meet all
applicable requirements of the NEMA Standard Publication No. TS 2 Type 1 and the
Standard Specifications, including all supplements. Controllers shall utilize an
input/output interface conforming to Section 3.3.1 of the NEMA TS 2 Standard for all
input/output functions with the backpanel terminals and facilities, the malfunction
management unit, detector rack assemblies and auxiliary devices. The controller shall
be complete with a module, including modem card and physical connector to support future
closed loop communication.
3. The Bus Interface Unit (BIU) shall comply with Section 8 of the NEMA TS 2 Standard.
The BIU shall be fully interchangeable with any other manufacturer's unit and
interchangeable in a NEMA TS 2 Type 1 cabinet assembly. The BIU shall perform the
interface function between Port 1 at the controller unit, the malfunction management unit,
loop detector rack assembly, and the backpanel terminal and facilities. As a minimum,
two (2) LED indicators shall be provided on the BIU front panel. One indicator shall serve
a dual use: as a power on indication and as a diagnostic indicator for proper operation of
the device. The second indicator shall serve as a transmit indicator illuminating each
time data is transmitted.
4. The malfunction management units (MMU) shall comply with Section 4 of the NEMA TS
2 standard. The MMU shall be capable of operating as either a Type 16 with 16
channels (8 vehicle, 4 pedestrian, 4 overlap) or a Type 12 with 12 channels (8 vehicle, 4
overlap). The MMU’s supplied shall be configured to operate as Type 16 units. The
MMU’s in either the Type 16 or Type 12 configuration shall be capable of operating in a
NEMA TS 2 Type 2 cabinet, a NEMA TS 2 Type 1 cabinet, or a NEMA TS 1 cabinet
without loss of functionality. The MMU shall be connected directly to the controller unit
to support enhanced MMU monitoring of controller operations. The MMU shall support
flashing yellow operation and/or shared signal faces with protected/permissive left turn
phases.
5. Load switches shall comply with Subsection 6.2 of the NEMA TS 2 Standard. All load
switches shall utilize optically isolated encapsulated modular solid-state relays.
Discrete components on circuit boards are not acceptable. Load switch indicator lights
shall be LED-type and wired on the input side of the device. The controller cabinet
assembly shall be initially supplied with a full complement of load switches to
accommodate each available position of the backpanel.
6. Flashers shall comply with Subsection 6.3 of the NEMA TS 2 Standard and be
equipped with two output indicator lights which will show flashing power out to the
cabinet assembly.
7. Flash transfer relays shall comply with Subsection 6.4 of the NEMA TS 2 Standard. The
field electrical loading for flash operation shall be wired through the transfer relays such
that the load on the 2-circuit flasher is as balanced as possible within the limitations
of the signal phasing. The controller cabinet assembly shall be initially supplied with a
full complement of flash transfer relays to accommodate each available position of the
backpanel.
8. The emergency vehicle pre-emption system shall be installed in the same cabinet as the
controller. The system shall be compatible with the Town’s existing pre-emption
equipment. It shall be the Contractor’s responsibility to ensure that the system is
compatible with the Town of Yarmouth’s existing pre-emption system. The emergency
vehicle pre-emption control system shall consist of a data-encoded phase selector to be
installed within the traffic control cabinet. This unit will serve to validate, identify, classify
and record the signal from the optical detectors located on support structures at the
intersection. The optical detectors shall be single input, single output units used to
control one approach. All traffic signal installations shall be supplied with a minimum of
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two optical detectors unless otherwise noted in the major item list. The phase selector
shall be a rack-mounted plug-in two or four channel, dual priority device. The phase
selector shall plug into a shelf-mounted single card slot chassis. Programming the phase
selector shall be via a PC-based computer utilizing unit specific software. One copy of
software, on compact disc shall be supplied and licensed to the Town of Yarmouth. A
hard copy of final programming data shall be left in the control cabinet. The Contractor
shall supply a complete set of interface cables for phase selector to laptop connection.
The Contractor shall install a confirmation strobe at the traffic signal location as shown on
the plans. The confirmation strobe shall serve to validate to the driver of the emergency
vehicle that the traffic signal has recognized the pre-emption call and will initiate the
proper pre-emption sequence. The confirmation strobe shall have a clear/white lens.
9. Loop wire shall be encased in a protected plastic tubing of PVC or polyethylene plastic,
IMSA 51-5,0.25-inch outside diameter, and the wire may have cross-linked polyethylene
insulation or it may have THHN/THWN insulation. Splicing insulator shall be an approved
re-enterable rigid body splices kit with a non-hardening sealing compound compatible
with the wire insulation.
10. The loop amplifiers supplied shall be rack mount, Type C, two channel units with delay
and extension timing internal to each unit's channel conforming to Section 6.5 of the
NEMA TS 2 standards. The detector shall fit in a standard card rack conforming to
Section 6.5 of the NEMA TS 2 Standard. The detector rack assembly shall be a Type 2
configuration conforming to Section 5.3.4 of the NEMA TS 2 Standard. The two channel
card rack loop amplifier unit shall occupy one of the rack slots. Each amplifier channel
shall be labeled with the detector number. The detector unit shall be capable of
operating in a voltage range from 10.8 to 26.5 VDC. The unit shall operate from the
cabinet's external power supply at 12 VDC. Detector units shall be microprocessor
controlled, fully digital, self-tuning, and capable of detecting bicycles. Each channel of a
dual-channel amplifier shall be connected to a series of wire loop detectors. Inductive
vehicle loop detectors shall utilize a Liquid Crystal Display (LCD) to indicate the
operational, set-up, and loop diagnostic parameters of the detector/loop system.
Additional amplifiers shall be supplied if so required by the major items list on the plans.
11. The controller cabinet shall conform to the NEMA TS 2 Type 1 Standards, Section 7.
Cabinet size shall be as shown below. It should be noted that approximate cabinet
dimensions are in inches. The Cabinet shall be a ground-mounted type and installed on
cement concrete foundation as shown on the plan.
NEMA
TS 2
Cabinet
Cabinet Size
(Nominal)
(HxWxD*)
Back Panel
Mounting
Malfunction
Management
Unit
NEMA Size 6 56”x44”x27.5” 16-Position Ground 16 Channel
* Approximate cabinet dimensions are provided in inches.
The control cabinet shall be made of aluminum with an interior and exterior painted
aluminum finish. The control cabinet shall be initially wired with a “D” harness. All
wires for this harness shall be properly terminated on the backpanel.
The cabinet shall also be wired with a normally closed switch connected to a user
defined input to the controller for remote monitoring of the control cabinets’ door open
status. The controller cabinet shall also be supplied with a Manual Police Button to
manually control the operations of the traffic signal via the Police Door Access Panel.
There shall be two switches for the police door: 1) Main power switch and 2) A switch for
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Dennis Yarmouth Regional School District 100% Construction Documents
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switching the controller from automatic to flashing operation and vice versa, with the
controller power “off” in flashing operation.
The following requirements are applicable to each signalized location and are designed
for effective use of a laptop computer in conjunction with traffic signal controllers. These
requirements are also designed to permit all engineers, electricians and technicians
(including those who are disabled but ambulatory) to work in the cabinet in a safe,
effective and comfortable manner. To this extent, the following meets applicable ADA
requirements.
a. Furnish and install one slide-out/slide-in shelf or swing-out/swing-in shelf
appropriate for the size and load of a laptop computer. This moveable shelf
shall support the bottom of the laptop computer at a height between 3'-4" and 3'-
8" above finished grade in front of the cabinet. All cables in the cabinet shall be
tied away to allow the shelf to be opened and closed smoothly without any
obstructions.
b. Both the firmware and software version in each timer unit shall be the same
throughout the project and shall be the latest version available on the market.
In addition, the Contractor shall promptly furnish to the Town and install all
upgraded versions of both firmware and software through the last day of the
inspection period, guarantee period or warranty period, whichever date is later.
c. The Contractor shall furnish one cable with each new timer unit to connect a
controller timing mechanism to a laptop computer. This cable shall have a
termination at one end to match the controller. It shall have a termination on the
other end to match the type of serial port found on laptop computers, usually DB9.
This cable shall be wired to provide serial RS232C communication between the
controller and the computer.
d. Payment for the work described above shall be deemed to be incidental to and
included in the prices bid for various items of traffic signal work, and no
additional payment shall be made for the work described above.
12. Signal posts and bases shall be steel shafts with octagonal bases (refer to “Standard
Drawings for Traffic Signal and Highway Lighting”, 1968).
13. Foundations for all traffic signal equipment shall not obstruct a sidewalk so that passage
meets ADA and AAB requirements.
14. The Contractor shall obtain soil borings, as applicable at each proposed mast arm
foundation location to support the design of each mast arm foundation. The Contractor
shall be responsible for designing and constructing the foundations in accordance with
the Standard Specifications, this specification and the relevant provisions and design
parameters contained in MassDOT’s “Overhead Signal Structure & Foundation Standard
Drawings”; link to page:
https://www.mass.gov/files/documents/2017/10/24/OverheadSignalStructure_Foundation
StdDrawings.pdf and the information contained in the boring logs.
The Contractor is responsible for the design of all mast arm foundations, regardless of
soil conditions and any ledge that may be found at the proposed foundation locations. In
the event that soil conditions or ledge prevent the use of the MassDOT standard
foundation type, the Contractor is responsible for selecting and designing alternative
foundation types. Alternative foundation types may include spread footings, coring and
socketing into rock or other foundations previously used to support similar loads. All
shop drawings and calculations shall be stamped by a Professional Engineer registered
in Massachusetts and submitted to the Engineer for approval. Foundations for Signal
Posts, Mast Arm Poles, and Controller Cabinet shall be constructed using 4000 psi, 1½
inch, 565 Cement Concrete conforming to the relevant provisions of Section M4 of the
Standard Specifications and the following:
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Reinforcing steel shall be ASTM A-615, Grade 60.
The Contractor shall submit shop drawings of any bolt circle details for approval by the
Engineer.
All mast arm poles shall be galvanized steel monolevers with shoe bases, unless
otherwise directed. Acceptance of Type II mast arm poles shall be contingent upon
review and approval of the shop drawings submitted by the Contractor. Longhand design
calculations shall be submitted for all Type II Mast Arms. The pole and arm shaft shall
be fabricated from commercial quality hot rolled steel. The shaft shall have only one
(1) longitudinal, automatically, electrically welded joint, and shall have no intermediate
horizontal joints or welds. Only one (1) length of steel sheet shall be used, which shall
be formed into a continuously tapered shaft, having a taper length of 0.14" per foot.
15. Signal heads shall be rigid mounted on mast arms, with the bottom of all signals at
the same height. All traffic signal lenses shall be 12” in diameter unless otherwise
noted on the plans. Louvered backplates shall be 5” provided on all signal heads.
Backplate shall have a 3-inch yellow micro-prismatic retroreflective sheeting along the
outer edge. All signal heads shall be equipped with light emitting diode (LED) 12”
modules as noted on the plans. Signal heads shall be made of aluminum. Signal
heads shall be installed with cut tunnel visors unless otherwise noted on the major items
list on the plans.
The LED module shall be a prequalified item from MassDOT’s Qualified Traffic Control
Equipment (QTCE) list for Traffic Control Devices. See “Section 815: Traffic Control
Signals” on the MassDOT website: https://www.mass.gov/lists/massdot-qualified-traffic-
control-equipment-qtce
To prevent the LED module warranty from being voided, the connecting leads on the
module shall not be cut. The original LED module leads shall be connected to the signal
head terminal block as continuous wire without splices. The Contractor shall provide to
the Town, a written warranty from the manufacturer, which provides the LED signal
module to be replaced or repaired by the manufacturer if it exhibits one of the following:
a. A failure due to workmanship or material defects within the first 60 months of field
operation.
b. A greater than 40 percent light output degradation or a fall below minimum
intensity levels (as defined by the latest ITE performance specifications) within the
first 36 months of field operation.
All signal and pedestrian displays shall be equipped with LED signal modules. All red,
amber, green, and pedestrian signal housings with the exception of optically programmed
and fiber optic housings shall conform to the following where applicable:
a. ITE’s Vehicle Traffic Control Signal Heads – Light Emitting Diode (LED) Arrow
Traffic Signal Supplement, Dated July 1, 2007.
b. ITE’s Vehicle Traffic Control Signal Heads – Light Emitting Diode (LED) Circular
Signal Supplement, Dated June 27, 2005.
c. ITE’s Pedestrian and Countdown Signal Modules Compliant to PTCSI – Part 2
Light Emitting Diode (LED), Dated August 2010.
d. Energy Star / EPACT Program Requirements for Traffic Signals.
e. On the MassDOT Traffic Signal QTCE List.
An independent lab shall certify that the LED signal module complies with the applicable
ITE specification. The independent report should be submitted to the Engineer for
review unless the module is already on the QTCE list.
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LED signal modules must be type tested and approved in accordance to the
requirements of Subsection 815.21 of the Standard Specifications for Highways and
Bridges.
On the backside of the LED signal module there shall be a permanently marked “up”
arrow to aid in the proper orientation of the module during installation. The
manufacturer’s name, trademark, serial number and other necessary identification shall
be permanently marked on the backside of the LED signal module.
The LED signal module shall be a single, self-contained device, not requiring on-site
assembly for installation. The LED signal assembly construction shall conform to the
applicable ASTM specifications for the materials used to fabricate the module. Each LED
signal module shall comprise a smooth surfaced Red, Yellow, or Green UV stabilized
polycarbonate outer shell, multiple LED light sources, a power supply and a polycarbonate
back cover assembled in a gasketed or silicon sealed unit.
The minimum luminous intensity values and light output shall be maintained within the
rated input voltage of 117 Volts AC. LED signal modules shall not be allowed to fall short
of the minimum intensity values at any of the 44 measuring points of the standard when
lamp is turned on cold for measurements and after a 30 minute warm-up time period at
100% duty cycle.
16. Pedestrian head indications shall be illuminated LED type displaying the graphical
symbols of a walking person and/or upraised hand. All LED indications on the pedestrian
signal shall have an automatic dimming circuit for night illumination to reduce long-
term degradation to the LEDs. Pedestrian heads shall be made of aluminum housing
with cap visor. Each visual pedestrian indication shall be complemented by a time
display indication. Each time display indication shall be self-programming and
microprocessor based, with red LEDs used in the display. The time display will
countdown the amount of time remaining in each flashing don’t walk time interval for
viewing by the ambulatory public. 17. Pedestrian push buttons shall be located as close as practicable to the sidewalk curb
ramp serving the controlled crossing and shall permit operation from a clear ground
space. If two crosswalks, oriented in different directions, end at or near the same
location, the positioning of pedestrian push buttons and/or legends on the pedestrian
push button signs should clearly indicate which crosswalk signal is actuated by each
pedestrian push button. Pedestrian push buttons shall be installed on a saddle of cast
aluminum with the approved MassDOT, Highway Division instructional legend (i.e. sign),
firmly attached to the casting. The saddle shall have a clear coat finish. The plunger shall be a maximum of 42 inches above the finished sidewalk and a minimum of
two inches in the smallest dimension. The force required to activate controls shall be no
greater than 5 lbs. This sign and saddle shall be used in locations where a push button is
shown on the plans.
18. Audible pedestrian signals shall be provided. The accessible pedestrian
signals/pedestrian push buttons shall provide visually impaired pedestrians with a locator
tone that will allow them to find the push button to actuate the walk signal. Once the
push button call has been placed, the button will provide both an audible and a tactile
response during the WALK phase of the cycle. The push buttons shall clearly indicate by
means of tactile arrows which crosswalk signal is actuated by each push button. Audible
pedestrian signals shall be of the type which produces a percussive tone during the walk
signal. The Audible WALK indicator shall be a rapid tick tone, repeating at 8 to 10 ticks
per second. Output levels shall be 90 decibels @ 3 feet and be self-switching to one of
two output levels depending on ambient noise conditions. Audible pedestrian signals
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shall conform to the requirements of the MUTCD, including sound level requirements for
locator tone and percussive tone during the walk signal.
19. Wherever electronic traffic signal equipment is located (e.g. cabinets, etc.), each input
and output should be surge protected except traffic signal outputs. Signal outputs from
load switches do not need surge suppression since the load switches act as surge
suppressors. The surge protector must be electrically connected to the nearest grounded
metal structure or nearest ground rod. Surge protection for power service shall conform
to the current NEMA TS-2 standard except surge capacity shall be 80 kA. The product
complies when a lab report from an independent test laboratory stating the product
passes the current NEMA TS-2(5.4.2.4) specification (with the additional surge capacity
of 80 kA) is submitted with the shop drawings. Surge protection for all loop and
pedestrian button connections should have peak surge current protection of at least 10K
amperes with a response time of less than 5 nanoseconds. The product complies when
a lab report from an independent test laboratory stating the product passes this
specification is submitted with the shop drawings. Units should be unconditionally
warrantied for at least 10 years.
20. All local controller, malfunction management unit, loop detector amplifier, and emergency
vehicle pre-emption software shall be supplied with the latest available revision. Any
software upgrades released by the manufacturer shall be supplied at no additional
cost to the Town of Yarmouth for a period of five years after acceptance of the traffic
signal installation.
21. Each programmable local hardware component (i.e. controller, malfunction management
unit, loop detector amplifier, emergency vehicle pre-emption phase selector, etc.) shall be
initially programmed by the Contractor based on information contained on the plans.
Three bound sets of hard copy programming per device shall be supplied to the Town of
Yarmouth by the Contractor.
22. The front portion of the detector rack shall be provided with a marker strip to allow
identification of detector phase assignments.
23. Upon final acceptance of the signal by the Town of Yarmouth, the Contractor shall
supply an 8½”x11” or 11”x17” laminated copy of the traffic signal design plan and
sequence and timing chart to be left in the cabinet documentation envelope mounted on
the inside of the cabinet door.
24. All cable and wiring shall comply with the Standard Specifications.
2.05 FLASHING SCHOOL SPEED LIMIT SIGN ASSEMBLY
A. All work under this item shall conform to the relevant provisions of Section 800 of the Standard
Specification, the 2009 MUTCD, the previous Traffic Signal Equipment section, and the
following technical provisions.
1. The Flashing School Speed Limit Sign Assemblies shall include a pager programmable
time switch and cellular modem compatible with the existing Dennis-Yarmouth Regional
School System school zone control system, yellow LED signal heads, and LED
illuminated speed limit sign. The flasher assembly shall comply with the latest MUTCD
requirements and the latest Massachusetts Amendments to the MUTCD. See the
Flashing School Speed Limit Sign Assembly drawings for details (included in this
document).
2. The Flashing School Speed Limit Sign Assembly system shall be designed to operate
from a 120VAC power source and shall include an enclosure with a circuit breaker of
appropriate rating and electric meter socket.
3. Interface to the power line and to the controlled device shall be provided by means of a
cable harness terminated in a secure connector. Length of the cable shall be 48” or
more; wire shall be a minimum 18 gauge with 600 volt insulation suitable for at least
90 C. The unit shall be supplied complete with harness terminated on one end with an
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AMP connector #206037-1. The time switch shall use an AMP connector #206036-1 for
the plug connector.
4. Pin assignments shall be as follows:
a. Pin #1 - AC plus (line),
b. Pin #2 - AC minus (NEUT),
c. Pin #3 - Chassis GND,
d. Pin #4 - switch #1 common,
e. Pin #5 - switch #1 N.C.,
f. Pin #6 - switch #2 common,
g. Pin #7 - switch #2 N.O.,
h. Pin #8 - Spare,
i. Pin #9 - switch #4 common,
j. Pin #10 - switch #1 N.O.,
k. Pin #11 - switch #3 common,
l. Pin #12 - switch #3 N.C.,
m. Pin #13 - switch #3 N.O.,
n. Pin #14 - switch #4 N.C.,
o. Pin #15 -switch #4 N.O.,
p. Pin #16 - switch #2 N.C.
5. The Flashing School Speed Limit Sign Assembly system shall be designed to operate
over a temperature range from -30˚ F to +165˚ F.
6. Any proprietary software required for the programming and/or operation of the system
shall be included at no additional cost.
7. Each Flashing School Speed Limit Sign Assembly shall consist of two 8” yellow LED
indications and an LED with 20 displayed to indicate when the school zone is in effect.
a. When activated, the two yellow indications shall flash in an alternate flashing
sequence.
b. The beacons shall be flashed at a rate of not less than 50 or more than 60 times
per minute. The illuminated period of each flash shall be a minimum of ½ and a
maximum of ⅔ of the total cycle.
8. Each Flashing School Speed Limit Sign Assembly shall also contain a 12” signal housing
that contains yellow LED indications, which are capable of displaying two digits, e.g. 20.
9. The flasher shall be normally dark, shall initiate operation only upon activation via the
time switch. The 12” signal housing with speed limit yellow display shall be normally dark,
shall be illuminated only upon activation and shall not flash.
10. The flasher unit shall be individually housed and protected from the weather and must not
present a shock hazard to maintenance personnel.
11. The housings for the signal heads with visors shall have yellow color finish.
12. All poles/posts, brackets, bands, and hardware shall have the color finish to match the
traffic signal equipment.
13. The signal heads shall be fastened to the sign as recommended by the manufacturer.
14. The sign for the Flashing School Speed Limit Sign Assembly shall be 24” x 60”
retroreflective school speed limit when flashing sign. The ‘school’ section of the sign
shall have a yellow background with black legend and border. The remainder of the sign
shall have a white background with black legend and border.
PART 3 - EXECUTION
3.01 PULL BOX 12X 12 INCHES – SD2.031
A. The work under this item shall conform to the relevant provisions of Section 800 of the
Standard Specifications and the following:
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1. Where signal conduit enters a pull box, the bottom of the conduit shall be 30-inch
beneath the finished grade. Where 1½-inch loop lead-in conduit enters a pull box, the
top of the conduit shall be 18-inch below finished grade, as applicable. The cost to
sawcut existing sidewalk and pavement, and to repair and/or replace damaged sidewalk
and pavement surfaces (cement and bituminous concrete/hot mixed asphalt) as a result
of pull box installation shall be considered incidental to this item unless otherwise shown
on the plans.
3.02 3-INCH ELECTRICAL CONDUIT TYPE NM PLASTIC (UL )
A. The work under this item shall conform to the relevant provisions of Section 800 of the
Standard Specifications and the following:
1. Where new conduits are installed in grass and planted areas, no separate payment shall
be made for the excavation, sand bedding, gravel backfill, including necessary
compaction, or incidental materials, but all costs in connection therewith shall be
included in the contract unit price for this item.
2. Where conduit is installed in a sidewalk or driveway areas, no separate payment shall be
made for the saw-cutting, excavation, sand bedding, gravel backfill, including necessary
compaction, or incidental materials, but all costs in connection therewith shall be included
in the contract unit price for this item.
3. Trenches in existing bituminous concrete/hot mixed asphalt pavements not subject to full
depth reconstruction shall be sawcut in accordance with the plans. The existing
pavements shall be sawcut through their full depth and the pavement removed.
4. After conduit installation, the trench shall be backfilled with controlled density-fill (CDF).
CDF shall be Type 2E and shall be specified in Section M4.08.0 of the Standard
Specifications. The finished grade of the CDF shall be below existing pavement surface
as shown on the construction details.
5. Where conduit crosses roadways, no separate payment shall be made for the saw-
cutting of pavement, excavation, sand bedding, controlled density fill, or incidental
materials, but all costs in connection therewith shall be included in the contract unit price
for this item.
6. Patching and repairing the disturbed roadway, sidewalks, grass islands, etc. to match the
surrounding surfaces shall also be included under this item.
3.03 GRANITE CURB
A. The work under this item shall conform to the relevant provisions of Section 500 of the
Standard Specifications and the following:
1. The granite curb shall be set in accordance with MassDOT “Construction Standard
Details” drawing number 106.3.0, no separate payment shall be made for the excavation,
cement concrete curb lock, gravel subbase, including necessary compaction, or
incidental materials, but all costs in connection therewith shall be included in cost of the
furnishing and setting of the granite curb.
2. The granite curb shall be cut and transition as necessary to provide the proper transition
lengths in accordance with the plans and the relevant MassDOT “Construction Standard
Details” or as directed by the engineer.
3.04 BORINGS FOR MAST ARM FOUNDATIONS
A. The work to be done under these items shall conform to the relevant provisions of Section 190
of the Standard Specifications and the following:
1. Hollow stem auger borings for traffic signal mast arm foundations shall be taken at the
locations specified on the plans. The borings shall be located at the center of the
foundation for each proposed mast arm foundation. The Contractor will calculate the
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ground moment on each support using the AASHTO 2013 “Standard Specifications for
Structural Supports for Highway Signs, Luminaries, and Traffic Signals” with all interim
revisions. From the ground moment the Contractor will determine the highest bottom
elevation (HBE) for each foundation. Unless bedrock is encountered before the HBE, the
borings shall be taken to a depth 10 feet below the HBE. If a sampling at the 10 feet
below the HBE indicates 50% or more silt, clay, or organic soil, then the boring will be
continued an additional 10 feet below the HBE.
2. A standard penetration test using a split spoon sampler will be made at the ground
surface, and at every change in soil stratum, but the sampling intervals shall not exceed 5
feet in a continuous stratum. The auger hole will terminate at the specified bottom
elevation and split spoon sample will be taken at the bottom of the hole.
3. A volume sample will be taken at 5 foot intervals in order to classify the subsurface soils
with respect to grain size and visual classification as required. Each sample shall consist
of the remainder of the spoon sample and shall be contained in 6 inch jars, appropriately
labeled. The purpose of this method along with its sampling procedure is to determine
the visual properties, arrangement and thickness of the various soil strata as they exist in
the ground. The elevations/depths at which any change in stratification occurs shall be
located and recorded on the log by the driller. Detection of stratum changes should be
made by careful observation of the soil as it exits the augured hole and by the rate of
penetration of the auger during drilling. The inner diameter (I.D.) of the auger casing
shall be a minimum of 2 ¾ inches for all holes in which split spoon samples are required.
The outside diameter (O.D.) shall be a maximum of 7 inches in order to limit the size of
the resulting hole. Due to the size of the resulting auger hole it is particularly important
that upon completion, all borings shall be backfilled with clean, well-graded sand and
tamped in order to fill all voids created during the auguring procedure.
4. As the boring is advanced, care shall be taken to note and record the depth where wet
soil is encountered if this should occur. If groundwater is encountered, then the water
level in the hollow stem shall be maintained at the top of the casing at all times during the
sampling operation in order to avoid unequal hydrostatic pressure which may result in a
blow-in of fine granular soils and inaccurate blow counts. In each boring the driller shall
record the water level prior to backfilling and whenever possible, prior to the start of each
day's work. Each boring shall be advanced by using a hollow stem auger with cutting
head and center rod and plug assembly. The hollow stem auger will advance and case
the hole simultaneously to the required sampling levels. The center rod and plug
assembly is held in place by the cap and inside drill rod connecting the auger and its
assembly to the rotating spindle on the drill in order to prevent soil from entering the
mouth of the auger. Upon reaching the sampling level, the plug is to be retracted by
withdrawing the center rod to permit lowering of the sampler through the auger. The
sample shall be obtained by driving the sampling into the undisturbed material below the
bottom of the auger. The sampling and handling procedure will be as specified under
Section 190.62 of the Standard Specifications. After the sampling operations are
completed and the sampler has been retracted, the plug is re-inserted and held in place
by the center rod; another auger section is connected to the first, together with one
additional center rod to secure the plug to the cap, and the hole is advanced. This
procedure may be repeated until the specified bottom elevation is reached. The auger
shall be stopped at any depth level to allow normal sampling practices upon request by the Engineer. If in the judgment of the Engineer; the borehole cannot be advanced by
the hollow stem auger method due to the material encountered (with the exception of bedrock); and every attempt has been made by the driller to advance the hole; then the
Engineer may direct the driller to complete the boring using the conventionally cased,
drive sample, wash boring method as specified in Section 191.61 of the Standard
Specifications.
5. The sample jars shall have positive identification of the contents by typewritten, glued on
labels. The following information shall be shown:
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a. Name and address of boring contractor.
b. Date sample was taken.
c. Location and name of project.
d. Location of borehole by station and offset or identifying number of borehole, if so
identified on plan.
e. Depth below ground surface at which sample was obtained and recorded blow
counts per of 6 inches penetration of the sample.
6. Samples and boring logs shall be delivered to a testing laboratory for soil classifications.
7. Obstructions shall be considered according to Section 190.60E of the Standard
Specifications.
8. If rock is encountered at an elevation above the specified highest bottom elevation then a
rock core boring will be made in accordance with Section 190.63 of the Standard
Specifications.
9. Practical refusal of the sample spoon or 'refusal' is as defined by Section 190.60E of the
Standard Specifications.
10. Copies of the final boring logs shall be submitted to the Engineer with the shop drawings
for the mast arm foundations.
B. Place bituminous concrete pavement/hot mixed asphalt for roads and walks in two courses of
thickness as shown on the drawings.
3.05 TRAFFIC SIGNAL EQUIPMENT
A. All work under this item shall conform to the relevant provisions of Section 800 of the Standard
Specification, the 2009 MUTCD, and the following:
1. As soon as notice to proceed with construction is given, the Contractor shall submit a
request to the servicing utility companies for electrical service on behalf of the Town of
Yarmouth. Service connections shown on the plans are approximate only. The
Contractor shall determine exact locations from the servicing utility, arrange to
complete the service connections, and be responsible for all charges incidental thereto.
A 100-ampere meter socket approved by the servicing utility company shall be furnished
and installed on the side of the control cabinet by the Contractor. A 3-inch PVC conduit
shall be installed from the controller cabinet to the utility pole and/or electric manhole,
which will supply electrical service to the controller cabinet. This conduit shall be
encased in cement concrete where crossing roadways and/or driveways. An electric
company approved handhole shall be placed in line between the controller cabinet and
service connection and the utility pole and/or electric manhole which will supply electric
service to the controller cabinet. The handhole shall be located as directed by the
electric company. See Standard Drawing 813.1.0 - Traffic Signal Service Connection –
Overhead for details (included in this document).
2. Changes from automatic flashing to stop-and-go operation and from stop-and-go to
automatic flashing operation shall occur as set forth in Section 4D.28 – 4D.31 of the 2009
MUTCD.
3. Wire loop detectors shall be installed in the roadway for vehicle and bicycle detection. In
advance of the loop detector installation, the Contractor shall mark, on site, the loop
detectors with any changes required by field conditions such as manholes. The loop
detector layout shall be inspected and approved by the Engineer before the loop
detectors are installed. Splicing and connection shall be made in the pull box nearest the
roadway loop sensor, but not exceeding four loops per pull box. All loops included in a
detector group as shown on the plans shall be spliced in a single pull box. Each lead and
lead-in connector shall be stripped back and spliced using a pressure type wire connector
applied with a crimping tool. Multiple loop sensors shall be identified as detailed on the
plans. Lead-in splicing shall be staggered to prevent contact with each other. Each
crimped splice shall be soldered and insulated. The insulation material shall be heat-
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shrinked polyolefin. The shielded lead-in cable outer jacket and shield shall be stripped
back sufficiently to ensure that the shield cannot come into contact with the spliced
conductors. Follow the instructions of the kit manufacturer for this procedure when
installing the re-enterable splice kit. The above splice shall be done on the day of the
loop wire installation to prevent the entrance of any moisture into the plastic tubing. The
lead-in conductors shall be connected to the appropriate terminals in the controller
cabinet, by using crimped or soldered terminal ends. The heat source for soldering shall
be electrical not exceeding 30W capacity. The following test procedure shall be
performed in the presence of the Engineer before and after the loop sensor is sealed in
the pavement as detailed below. The cost of equipment, labor, and materials to perform
such testing and similar re-testing following repairs, replacement, or adjustment of any
detector within the project area shall be included in the contract unit price for this item.
After installation of wire loop sensors in the roadway and installation of shielded lead-in
connecting the loop sensors to the controller cabinet, each loop sensor and lead-in
combination shall be tested (at the controller cabinet) for proper installation. The
resistance from lead to lead of the same loop shall not exceed three (3) ohms per one
thousand (1000) feet as measured by a high quality meter suitable for measurements of
low resistance in the range of 1 to 6 ohms. A megohm meter test at 500 volts DC shall
be made between the two leads of a loop/lead-in combination temporarily spliced
together, but otherwise disconnected from all terminals, and the shield drain wire and the
earth ground connection. These resistances shall be at least one hundred (100)
megohms. A megohm meter test at 500 volts DC shall be made between lead-in shield
and the earth ground rod. This resistance shall be at least one hundred (100) megohms.
The meter used for these tests shall be checked for calibration each day of use by using
a resistor block of 5% resistors simulating loads of 1 megohm, 20 megohm and 100
megohms. The observed meter reading shall be 10% of the nominal resistor load. If any
loop sensor and lead-in combination fails to pass any one of the four (4) tests, it shall be
repaired and then re-tested on two occasions at least two (2) weeks apart and then shall
pass on each re-test occasion. If the loop sensor lead-in combination does not pass all
these re-tests, a new loop sensor and/or lead-in shall be installed, and shall pass these
tests, at no additional cost. After the above tests have been satisfactorily completed, all
loop sensor/shielded lead-in inductance shall be measured and a written report of the
results shall be filed with the Engineer and a copy stored with the “box prints” at the
intersection.
4. Upon receiving a valid signal from the pre-emption optical detector, the phase selector
shall generate a pre-empt call to the controller initiating a pre-emption operation as
shown on the plans. The Contractor shall be responsible for the proper programming of
the phase selector, orientation of the optical detectors, and all other work necessary to
provide a complete and operating emergency vehicle pre-emption system. The
Contractor may be required to field adjust the location of the optical detectors for
optimum line of sight detection in the presence of the Engineer to properly detect pre-
emption calls from approaching vehicles. The strobe light for the emergency vehicle pre-
emption system shall not be energized by a spare traffic signal conductor. It shall be
connected to the cabinet by its own #14-4 wire.
5. Controller cabinet foundations shall not obstruct a sidewalk or crosswalk so that passage
meets ADA and AAB requirements. A ½- inch bead of silicone sealant is required to form a waterproof seal between the controller cabinet and the top of the concrete foundation.
6. The Contractor shall perform testing of the equipment grounding system in the presence of the Engineer in accordance with the Standard Specifications.
7. Signal base foundations shall not obstruct a sidewalk so that passage meets ADA and
AAB requirements.
8. Upon the Engineer’s written approval, the Contractor may begin the placement of cement
concrete for foundations for mast arms, signal posts, and cabinets. The Contractor shall
not begin operations until receipt of the Engineer’s authorization. Anchor bolts shall be
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set accurately and tops shall be formed neatly. The top forming shall extend downward
for a minimum of 24 inches on the side of any foundation. The lower portions of all
foundations may be placed directly against undisturbed earth or may be formed at the
option of the Engineer. Neither forms nor reinforcing for foundations may be set nor shall
cement concrete be placed until the excavation has been inspected by the Engineer and
approval to proceed has been given. Foundations shall not obstruct sidewalks or
crosswalks and shall be located such that an accessible sidewalk width is maintained.
The top of foundations installed in sidewalks shall be set at grade with the sidewalk.
Anchor bolts shall be set accurately and tops shall be formed neatly.
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3.06 FLASHING SCHOOL SPEED LIMIT SIGN ASSEMBLY
A. All work under this item shall conform to the relevant provisions of Section 800 of the Standard
Specification, the 2009 MUTCD, the previous Traffic Signal Equipment section, and the
following:
1. As soon as notice to proceed with construction is given, the Contractor shall submit a
request to the servicing utility companies for electrical and communications service on
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behalf of the Town of Yarmouth. The Contractor shall determine exact service
connections locations from the servicing utility, arrange to complete the service
connections, and be responsible for all charges incidental thereto.
2. The work shall include removing and legally disposing the existing flashing school speed
limit sign assembly equipment from Station Avenue as indicated on the plans including
the removal and disposal of the foundations and electrical system; removing and
disposing or abandoning existing handholes (if applicable) and signal conduits/cables;
disconnecting the power source; removing the riser from the utility pole. The Contractor
shall coordinate with the servicing utility companies regarding the electrical service
removal at existing locations being eliminated.
3. The work shall include removing supports, excavating the existing foundations, the
disposal of the concrete and supports, removal and disposal of pull boxes (if applicable),
the backfilling with compacted gravel of the holes resulting from the excavation and
removal of the supports and the replacement, in kind, of any surface material disturbed.
4. The existing flashing school speed limit sign assembly shall remain in operation and
functional during construction unless otherwise directed by the Engineer.
5. The meter socket and communication equipment shall be set behind the sign.
6. The bottom of the sign shall be set at 7’ (minimum) above the adjacent finished grade.
6.7. See the Flashing School Speed Limit Sign Assembly drawings for details (included in this
document).
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