HomeMy WebLinkAboutRS_Traffic_Memo_190315_v2.pdf
12131 113th Avenue NE, Suite 203, Kirkland, WA 98034 | 425.821.3665 |
MEMORANDUM
Date: January 21, 2019 TG: 1.18365.00
To: Poppi Handy and Suzanne Davis – third place design co-operative
From: Francesca Liburdy and Stef Herzstein, PE, PTOE – Transpo Group
Subject: Homestead Willowcrest Townhomes Trip Generation Study
The City of Renton Traffic Impact Analysis Policy Guidelines for New Development (January 2016)
require a Traffic Impact Analysis (TIA) when a proposed project is anticipated to exceed 20
vehicles per hour generated in either the weekday AM or PM peak hour. The following
memorandum summarizes the project description and estimated weekday trip genera tion for the
proposed Willowcrest affordable townhome development in Renton, Washington as requested by
City staff.
Project Description
The proposed development would construct 12 townhomes between Edmond Avenue NE and
Glenwood Avenue NE. Access would be provided via the existing driveway serving the Glenwood
Townhomes. The preliminary site plan is shown on Figure 1.
Figure 1 – Preliminary Site Plan
2
Trip Generation
Trip generation for the proposed project was estimated based on the Land Use #220 (Multifamily
Housing (Low-Rise)) average trip rates from Trip Generation, 10th Edition, Institute of
Transportation Engineers (ITE), 2017. Weekday daily and AM and PM peak hour trip generation
estimates are summarized in Table 1 and include inbound and outbound daily and peak hour
estimates.
Table 1. Estimated Weekday Trip Generation
Project Trips
Land Use Size Rate1 Total In Out
Multifamily Housing (Low-Rise) LU #220 12 du
Weekday Daily 7.32 88 44 44
Weekday AM Peak Hour 0.46 6 1 5
Weekday PM Peak Hour 0.56 7 4 3
Note: du = dwelling units
1. Trips rates from ITE Trip Generation Manual, 10th Edition (2017).
As shown in Table 1, it is estimated that 12 townhome units would generate approximately 88
vehicle trips over the course of a typical weekday including 5 trips during the weekday AM peak
hour and 7 trips during the weekday PM peak hour. Based on the anticipated weekday AM and
PM trip generation and the City’s 20-trip threshold, a TIA would not be required for the proposed
project.