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2802 Wetmore Avenue Suite 220 Everett WA, 98201
Tel: 425-339-8266 Fax: 425-258-2922 E-mail: info@gibsontraffic.com
MEMORANDUM
To: Eric Blank, Low Income Housing Institute
From: Brad Lincoln, PE
Project: Renton Commons
GTC #16-088
Subject: Traffic Analysis
Date: April 18, 2016
This memorandum summarizes the trip generation calculations for the Renton Commons
development. The development is located on the west side of Whitworth Avenue S, between S 2nd
Street and S 3rd Street. The development is proposed to consist of a 6-story, 48-unit apartment building
for low-income housing. A site vicinity map in included in Figure 1.
Figure 1: Site Vicinity
Airport Way
SITE
Renton Commons Trip Generation Memo
Gibson Traffic Consultants, Inc. April 2016
info@gibsontraffic.com 2 GTC #16-088
Trip Generation Calculations
The trip generation calculations for the Renton Commons development are based on data contained
in the Institute of Transportation Engineers’ (ITE) Trip Generation Manual, 9th Edition – Volume 2:
Data (2012). The average trip generation rates for ITE Land Use Code 223, Mid-Rise Apartments
were used in the trip generation calculations for the proposed 48-unit building since it is a 6-story
building and satisfies ITE’s description of a mid-rise apartment building. Table 1 summarizes the trip
generation calculations.
Table 1: Trip Generation Calculations
48 New
Mid-Rise
Apartment Units
Average Daily Trips AM Peak-Hour Trips PM Peak-Hour Trips
Inbound Outbound Total Inbound Outbound Total Inbound Outbound Total
Generation Rate 4.181 trips per unit 0.30 trips per unit 0.39 trips per unit
Splits 50% 50% 100% 31% 69% 100% 58% 42% 100%
Trips 101 100 201 4 10 14 11 8 19
The Lacey Special Care Community development is expected to generate 201 new average daily trips
with 14 new AM peak-hour trips and 19 new PM peak-hour trips. The ITE data for Land Use Code
223 is included in the attachments.
Trip Distribution and Impacts
It is anticipated that trips generated by the Renton Commons development will split 50% traveling to
and from the north and 50% traveling to and from the south. The development will impact off-site
City of Renton intersections with less than 10 peak-hour trips impacting any public intersections.
Additional analysis of impacts to surrounding intersections should therefore not be required based on
City of Renton threshold requirements.
1 Based on comparison of daily and PM peak-hour trip generation rate for ITE Land Use Code 220, Apartment.
A
ITE Trip Generation Data
A - 1
A - 2
A - 3