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12131 113th Avenue NE, Suite 203, Kirkland, WA 98034 | 425.821.3665 |
MEMORANDUM
Date: October 25, 2021 TG:1.20316.00
To: Jonathan Chavez – City of Renton
From: Kassi Leingang, PE – Transpo Group
Subject: Jefferson Highlands Subdivision Trip Generation Summary
The following memorandum summarizes the trip generation estimate for the proposed Jefferson
Highlands townhome residential development. As demonstrated below, the estimated trip
generation for the proposed development falls below the City’s traffic impact analysis 20 trip
threshold and therefore no additional analysis is required.
Project Description
The Jefferson Highlands residential development is located south of NE 16th Street and bounded
on the east and west by Jefferson Avenue NE and Kirkland Avenue NE in the Renton Highlands.
The project would remove 3 buildings (1 single family home and 2 duplexes) totaling 5 dwelling
units and construct 18 townhomes with access provided along Kirkland Avenue NE. The site plan
is included in Attachment A.
Trip Generation
The trip generation for the proposed development was estimated based on Institute of
Transportation Engineers (ITE) Trip Generation Manual (10th Edition, 2017). The land uses
assumed for the proposal and uses to be removed include Single Family Detached Housing (Land
Use #210) and Multifamily (Low-Rise) (LU #220). The low-rise multifamily land use includes
townhomes. The estimated net new trip generation for the proposed development is summarized
in Table 1. The detailed trip generation estimate is included in Attachment B.
Table 1. Estimated Daily and Weekday Peak Hour Project Trip Generation
Daily
Trips
AM Peak Hour Trips PM Peak Hour Trips
Land Use1 DU In Out Total In Out Total
Proposed
Multifamily (LU #220) 18 132 2 6 8 6 4 10
Existing to be Removed
Single Family Detached Housing (LU#210) 1 10 0 1 1 1 0 1
Multifamily (LU #220) 4 30 0 2 2 1 1 2
Subtotal 40 0 3 3 2 1 3
Total Net New Trips 92 2 3 5 4 3 7
Note: DU = dwelling unit
1. Trip generation estimates based on the number of units and the daily and peak hour trip equations from ITE Trip Generation, 10th
Edition (2017).
As shown in the table, the project is estimated to generate 92 net new weekday daily trips with 5
occurring during the weekday AM peak hour and 7 occurring during the weekday PM peak hour.
As the estimated weekday AM and PM peak hour trip generation for the proposed project falls
below the City’s 20 peak hour trip threshold as identified in their Traffic Impact Analysis Policy
Guidelines for New Development, no additional analysis is required for the proposed development.
Attachment A:
Site Plan
Attachment B:
Trip Generation
Attachment B: Trip Generation
Land Use Setting Size Units Model Equation Rate Units Inbound % Inbound Outbound Total
18 du
Daily General Urban/Suburban Rate -7.32 per du 50%66 66 132
AM Peak Hour General Urban/Suburban Rate -0.46 per du 23%2 6 8
PM Peak Hour General Urban/Suburban Rate -0.56 per du 63%6 4 10
Land Use Size Units Model Equation Rate Units Inbound % Inbound Outbound Total
4 du
Daily General Urban/Suburban Rate -7.32 per du 50%15 15 30
AM Peak Hour General Urban/Suburban Rate -0.46 per du 23%0 2 2
PM Peak Hour General Urban/Suburban Rate -0.56 per du 63%1 1 2
1 du
Daily General Urban/Suburban Rate -9.44 per du 50%5 5 10
AM Peak Hour General Urban/Suburban Rate -0.74 per du 25%0 1 1
PM Peak Hour General Urban/Suburban Rate -0.99 per du 63%1 0 1
Subtotal
Daily 20 20 40
AM Peak Hour 0 3 3
PM Peak Hour 2 1 3
Daily 46 46 92
AM Peak Hour 2 3 5
PM Peak Hour 4 3 7
Total Net New
Multifamily (Low-Rise) (LU 220)
Single Family Home (LU 210)
Jefferson Highlands
Proposed Use
Existing Use
Net New Trips
Total Net New
Multifamily (Low-Rise) (LU 220)
1. Trip rates based on Institute of Transportation Engineers' (ITE) Trip Generation 10th Edition equation and average trip rate as shown above.
Notes: