HomeMy WebLinkAboutSD-22-05 - Supplemental - 0255 Kennedy Drive
BUCKHURST FISH JACQUEMART, INC. 115 FIFTH AVENUE NEW YORK, NY 10003 T. 212.353.7474 F. 212.353.7494
MEMORANDUM
To: Marla Keene, PE
City of South Burlington Development Review Planner
From: Georges Jacquemart, PE, AICP, Principal
Mark Freker, Senior Planner
Subject: O’Brien Hillside Farm TIA Review
Date: April 27, 2022
Introduction
This memo provides findings from BFJ’s review of L&D’s Traffic Impact Assessment (TIA) for the proposed
O’Brien Home Farm planned unit development, with particular attention on the site plan for Lots 13 and
15. BFJ reviewed the updated TIA (August 30, 2021) along with the L&D response letter dated November
22, 2021 which provides the most recent trip generation estimates for the Project. The sections below
organize BFJ’s comments pertaining to trip generation, signal warrants, and roadway alignment.
Trip Generation
BFJ reviewed revised trip generation estimates presented in the November 2021 L&D letter (based on ITE
11th Edition of Trip Generation). Although minor trip generation differences were noted when compared
to BFJ analysis, BFJ accepts L&D’s November 2021 trip generation update.
BFJ concurs with L&D’s November 2021 statement that the total pm peak hour trips are reduced from 280
to 270 vte/hour (3.6% decrease). However, BFJ highlights that am peak hour trips for all of Hillside
increased by 34 vte/hour (14.5% increase) which would be distributed on the roadway network. These
changes are not expected to have significant impacts. However, changes in the am peak hour could mean
that signalization is warranted earlier as detailed below.
Signal Warrant Analysis
BFJ conducted a review of L&D’s signal warrant examination by analyzing the volumes and methodology
presented in TIA Table 6 which follows the Manual on Uniform Traffic Control Devices (MUTDC)
standards. BFJ concurs with L&D’s review methodology and analysis based on Warrant 2 (Four-Hour
Volumes) and Warrant 3 (Peak Hour). Installation of a new traffic signal at the Kennedy Dr./Two
Brothers Dr. intersection should not commence until future traffic volumes exiting Two Brothers Dr.
satisfy either of these warrants based on volumes generated by the Hillside buildout and the proposed
Eastview development.
The Warrant 3 peak hour threshold is 100 vehicles per hour (vph) which is likely to be met sooner given
the revised November 2021 increase of am peak hour projections. TIA Table 6 demonstrates that at the
intersection of Two Brothers Dr. and Kennedy Dr. the 2025 LT Exit volumes are projected to be 79
whereas the RT Exit volumes are projected to be 37 for a total of 116 trips. These TIA estimates do not
account for the updated November 2021 trip generation estimates. As proposed by L&D, warrant
BUCKHURST FISH JACQUEMART, INC. 115 FIFTH AVENUE NEW YORK, NY 10003 T. 212.353.7474 F. 212.353.7494
analysis should be supported by periodic traffic monitoring, particularly during the am peak hour, to
note when vehicles exiting Two Brothers Dr. onto Kennedy Dr. is 100 vph or greater.
Lane Configuration of Two Brothers Drive
BFJ reviewed the lane configuration of Two Brothers Drive in relation to the Lots 13/15 driveways and
Kennedy Drive. Consideration was given to overall traffic circulation and outbound traffic queueing at
the Kennedy drive approach. TIA Table 5 provides the maximum queue necessary for the NB LT lane
(90’) and for the NB RT lane (25’). BFJ reviewed the distance between the Lot 15 driveway and Kennedy
Drive which is approximately 120’. This distance would support the necessary NB RT and LT lane lengths
for queuing purposes when the intersection is signalized.