The URL can be used to link to this page

Home My WebLink AboutRHart VHB Supp Traffic Info 051722 w attach1 Williams, Kathleen From:Randy Hart <RHart@VHB.com> Sent:Tuesday, May 17, 2022 1:17 PM To:Williams, Kathleen; John O'Reilly Subject:Route 6A Davenport Subdivision Attachments:Table 1Vehicular Crash Data.pdf Kathy, Thanks for the call this morning. Following up on your questions, please see my responses below in red: From: Williams, Kathleen <kwilliams@yarmouth.ma.us> Sent: Thursday, May 5, 2022 4:51 PM To: John O'Reilly <joreilly@jmoreillyassoc.com>; Robert Reedy <rreedy@jmoreillyassoc.com>; Paul Tardif Esq (Ptardif@tardiflaw.com) <ptardif@tardiflaw.com> Cc: Lima, Amanda <Alima@yarmouth.ma.us> Subject: Route 6A Davenport Subdivision Hi John/Bob/Paul, I have been reviewing the Route 6A Davenport Subdivision and had some specific questions related to the Traffic Assessment and the Homeowners Association as outlined below. I am compiling a Staff Report which will include additional comments which I will forward to you next week, but I wanted to get you these questions earlier. 1. Traffic Assessment: a) Crash Data: i) Please calculate the crash rate for Hockanom Road. The memo that was prepared looked at crash history, traffic generation, and sight distance exclusively. No traffic counts were conducted so it is not possible to calculate the rate, as volumes are necessary. However, given the low number of accidents, you can expect that the rate is well below the state average. ii) Is there a reason the Outward Reach intersection was not analyzed? We have pulled accident data for Outward Reach intersection with 6A (see attached). There were 2 property damage only accidents at that location in the latest 5 years of data that is available. iii) Would the Yarmouth Police Department have any supplemental crash data or is the MassDOT database the most accurate? We typically get police accident data when there is a demonstrated issue (based on MassDOT data). That is not the case here so I don’t believe pulling police records would be necessary. b) Sight Distance: i) In Table 3 – Route 6A at Proposed Sight Driveway Stopping Sight Distance (SSD), it would appear that the measured Stopping Sight Distance traveling eastbound would be the higher number, please confirm. The SSD is 900 + eastbound and 370+ westbound. They are shown backwards in Table 3. Sorry about that. ii) Why is the Intersection Sight Distance different for looking Left and Right? I have never seen this before. Intersection sight distance is based on the view exiting the driveway. Looking left is Attention!: This email originates outside of the organization. Do not open attachments or click links unless you are sure this email is from a known sender and you know the content is safe. Call the sender to verify if unsure. Otherwise delete this email. 2 substantially different than looking right at this location due to the geometry of the roadway, grades, and other features. iii) Are the measured values in Table 3 based on existing conditions, or do they take into consideration the proposed regrading and vegetation removal in the Sight Easement area? If existing conditions, what are the estimated sight distances with the recommended Sight Easement? Are there any other improvements that could be made to increase the ISD? Yes the sight distance referenced in the table is based on existing conditions. The proposed would be better than existing for both the site driveway and potentially Hockanom Rd. The clearing would have to be done and then measurements taken to really understand the improvement given the horizontal features to the east of the roadway but it appears the benefit could be in the 30 to 50 feet range looking east for ISD (critical movement). Can consider widening the sight triangle to the extent practical. iv) The Sight Easement recommended in the VHB Traffic Assessment is larger than that shown on the Plans. Ultimately, the Sight Easement including any additional slope grading needed should be adjusted on the Plans to meet that recommended in the VHB Assessment. John to provide. c) 400’ Waiver: The Applicant is requesting a waiver from the requirement that street intersections on Route 6a be spaced not less than 400’ apart (4.2.1(j)). It would appear that access to the site off Route 6a could be located 400’ from both Hockanom and Outward Reach. Please have VHB provide some documentation, conclusion or recommendation to support the requested waiver (i.e. is the proposed intersection location safer in their professional opinion). The site driveway has been positioned in a place that allows adequate sight distance in both directions. If the driveway were shifted to be 400 feet from both Hockanon and Outward Reach, the SSD westbound, and ISD looking right would be compromised and not conform to minimum standards necessary. Also by aligning with Hockanom Rd we are minizing the conflict points. Having three offset intersection in close proximity to one an other should be avoided when possible. d) MassDOT: The Comment & Resolution Form does not provide any information on whether MassDOT would feel comfortable issuing the highway access permit, it just outlines the procedures you need to follow to submit an application. Were there any substantive comments on the access location made by MassDOT? We have not reached out to MassDOT yet. That is typically done post local approvals. However, given my experience on projects like this, as long as we meet the sight distance requirements (we do) and there aren’t any major safety concerns (there are not), approval of the access driveway is very likely. 2. Homeowners Association: The Homeowner Association document submitted outlines the creation and operation of the Association. It mentions Maintenance Covenants in 4.1 and Declaration of Protective Covenants in 4.7, but based on the context these seem more related to what people do on their individual lots and were not submitted with the application materials. There needs to be some type of Maintenance Covenant that addresses the requirements for operation and maintenance of the private roadways, the utilities, the drainage systems (per an approved O&M Plan), landscaping, Open Space and Sight Easement, along with legal conveyance of the Open Space to the Homeowners Association who would be responsible for payment of taxes. A restriction enforceable by the Town will also need to be recorded to preserve the Open Space per Section 402.6.2. The document should also clearly define the homeowners responsibilities for operation and maintenance of any dry swales located on their property. Thanks, Kathy ---------------------------------------- Kathy Williams, PE Yarmouth Town Planner 1146 Route 28 South Yarmouth, MA 02664-4492 3 (508) 398-2231 Ext 1276 kwilliams@yarmouth.ma.us ro Randall C. Hart Principal/Senior Project Manager 101 Walnut Street PO Box 9151 Watertown, MA 02472-4026 P 617.607.6157 | M 617.549.0829 | F 617.924.2286 rhart@vhb.com Engineers | Scientists | Planners | Designers www.vhb.com VHB Viewpoints Explore trends and critical issues with our thought leaders. This communication and any attachments to this are confidential and intended only for the recipient(s). Any other use, dissemination, copying, or disclosure of this communication is strictly prohibited. If you have received this communication in error, please notify us and destroy it immediately. Vanasse Hangen Brustlin, Inc. is not responsible for any undetectable alteration, virus, transmission error, conversion, media degradation, software error, or interference with this transmission or attachments to this transmission. Vanasse Hangen Brustlin, Inc. | info@vhb.com Table 1 Vehicular Crash Data (2015 - 2019) Route 6A at Hockanom Road Route 6A at Kencomsett Circle Route 6A at Outward Reach Signalized? No No No MassDOT Average Crash Rate 0.57 0.57 0.57 Year 2015 1 0 1 2016 1 0 1 2017 0 0 0 2018 0 0 0 2019 0 0 0 Total 2 0 2 Yearly Average 0.4 0.0 0.4 Collision Type Angle 0 0 0 Head-on 0 0 0 Rear-end 1 0 2 Sideswipe, opposite direction 0 0 0 Sideswipe, same direction 0 0 0 Single Vehicle Crash 1 0 0 Not reported 0 0 0 Severity Fatal Injury 0 0 0 Non-Fatal Injury 0 0 0 Property Damage Only 2 0 2 Not Reported 0 0 0 Time of day Weekday ,7:00 AM - 9:00 AM 0 0 0 Weekday, 4:00 – 6:00 PM 1 0 1 Saturday 11:00 AM – 2:00 PM 0 0 1 Weekday, other time 0 0 0 Weekend, other time 1 0 0 Pavement Conditions Dry 2 0 2 Wet 0 0 0 Snow 0 0 0 Sand, mud, dirt, oil, gravel 0 0 0 Not reported 0 0 0 Non-Motorist (Bike, Ped) 0 0 0 Source: Crash data was obtained from MassDOT Crash Portal, accessed December 27, 2021.