HomeMy WebLinkAboutRS_Traffic_Trip_Generation_Memo_180330_v1 TENW
Transportation Engineering NorthWest
Transportation Planning | Design | Traffic Impact & Operations
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MEMORANDUM
DATE: March 14, 2018
TO: Robert McNeill
Barghausen Consulting Engineers
FROM: Spenser Haynie
TENW
SUBJECT: Trip Generation Memo for the proposed
Renton Toyota Overflow Parking Lot Expansion at 800 SW 16th Street
TENW Project No. 5668
This memorandum summarizes the trip generation estimate for the proposed expanded use of the existing
Renton Toyota overflow parking lot located at 800 SW 16th Street in Renton. This document describes the
existing trip generation, planned expansion of the parking lot, and estimate of future traffic activity with the
proposed expansion.
Project Site Description
The existing site includes a 25,300 square foot (SF) office building that is partially occupied by Shuttle
Express, and a parking lot that is utilized by the existing Shuttle Express operation and an overflow parking
lot for Renton Toyota to store vehicles. Vehicular access to the existing site is currently provided at two
locations; one via a driveway on SW 16th Street and the other via Raymond Ave SW as shown in the exhibit
below.
The proposed project includes expanding the existing parking lot to accommodate additional Renton Toyota
vehicles as an overflow. There will be no changes to the existing Shuttle Express operations with the proposed
project.
Renton Toyota Overflow Parking Lot Expansion
Trip Generation Memo
TENW March 14, 2018
Page 2
With the proposed project, vehicular access will be provided at three locations; the two existing access points
will remain, and the project proposes a new driveway curb cut on SW 16th Street, west of the existing
access. A preliminary site plan concept is included as Attachment A.
The next section describes the process used to estimate trip generation of the proposed expansion.
Existing Trip Generation
Existing traffic counts were collected at the site to identify the PM peak period (4:00 – 6:00 PM) trip
generation of the existing Renton Toyota operation at 800 SW 16th Street. Traffic counts were not collected
at the existing Shuttle Express operation since that would remain unchanged with the proposed Toyota
overflow expansion. Traffic counts were collected during the following time periods to establish a 3-day
average of the existing Toyota overflow parking operation:
· Tuesday, March 6, 2018 between 4:00 PM and 6:00 PM
· Wednesday, March 7, 2018 between 4:00 PM and 6:00 PM
· Thursday, March 8, 2018 between 4:00 PM and 6:00 PM
A 3-day average of the Renton Toyota peak hour trip generation at the existing site is summarized below in
Table 1.
Table 1
Existing Renton Toyota Operation at 800 SW 16th Street
PM Peak Hour Trip Generation Summary
PM Peak Hour Trips
Day Time Period In Out Total
Tuesday, March 6, 2018 5:00 – 6:00 PM 1 2 3
Wednesday, March 7, 2018 4:00 – 5:00 PM 2 3 5
Thursday, March 8, 2018 4:00 – 5:00 PM 0 0 0
3-Day Average 1 2 3
As shown in Table 1, the Renton Toyota operation at the existing site currently generates 3 PM peak hour
trips (1 entering, 3 exiting) based on a 3-day average.
Future Trip Generation
Future trip generation estimates associated with the proposed overflow parking lot expansion were based on
counts collected at the existing site, and a comparison of the sizes of the existing and future parking areas
with the proposed expansion.
The existing Renton Toyota operation at 800 SW 16th Street uses approximately 38,775 SF of parking area
to store their vehicles. With the proposed parking lot expansion (approximately 39,500 SF of new parking
area), the total future parking area is approximately 78,150 SF.
Based on the existing counts and the proposed parking lot expansion, the estimated weekday PM peak hour
trip generation associated with the proposed project is 6 trips (3 existing trips X 78,150/38,775).
Renton Toyota Overflow Parking Lot Expansion
Trip Generation Memo
TENW March 14, 2018
Page 3
Per City of Renton Traffic Impact Analysis Guidelines, a traffic impact analysis (TIA) is required when estimated
vehicular traffic generated from a proposed development exceeds 20 vehicles per hour during the PM peak
period. Based on the information presented in this memo, a TIA is not expected to be required for the
proposed parking lot expansion at 800 SW 16th Street.
If you have any questions regarding the information presented in this memo, please contact Spenser at (206)
390-7253 or spenser@tenw.com.
cc: Jeff Schramm – TENW Planning Manager
Attachment
Renton Toyota Overflow Parking Lot Expansion
Trip Generation Memo
ATTACHMENT A
Preliminary Site Plan Concept