HomeMy WebLinkAboutRS_TRAF-2017-12-14-TENW
Forest Terrace Preliminary Plat
Renton, WA
Transportation Impact Analysis
December 14, 2017
Prepared for:
PulteGroup
3535 Factoria Blvd SE, Suite 110
Bellevue, WA 98006
Prepared by:
TENW
Transportation Engineering NorthWest
11400 SE 8th Street, Suite 200
Bellevue, WA 98004
Office: (425) 889-6747
Fax: (425) 889-8369
Transportation Impact Analysis
Forest Terrace Preliminary Plat
TENW December 14, 2017
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Table of Contents
FINDINGS/CONCLUSIONS ........................................................................................ 1
INTRODUCTION ....................................................................................................... 2
Project Description ..................................................................................................... 2
Project Approach ...................................................................................................... 2
Primary Data and Information Sources ........................................................................... 2
EXISTING CONDITIONS ............................................................................................. 5
Roadway Network .................................................................................................... 5
Existing Traffic Volumes ............................................................................................... 5
Public Transportation Services ...................................................................................... 5
Level of Service ......................................................................................................... 7
Collision History ........................................................................................................ 8
FUTURE TRAFFIC CONDITIONS ................................................................................... 9
Planned Transportation Improvements ............................................................................ 9
Project Trip Generation ............................................................................................. 10
Project Trip Distribution and Assignment ....................................................................... 10
Future Traffic Volumes ............................................................................................... 10
Future Level of Service .............................................................................................. 14
MITIGATION .......................................................................................................... 14
Appendices
Appendix A – Peak Hour Turning Movement Counts
Appendix B – Level of Service (LOS) Calculations
Appendix C – Trip Generation Calculations
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TENW December 14, 2017
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List of Figures and Tables
Figure 1 Project Site Vicinity ....................................................................................................... 3
Figure 2 Preliminary Site Plan ..................................................................................................... 4
Figure 3 Year 2017 Existing Peak Hour Traffic Volumes .................................................................. 6
Figure 4 Project Trip Distribution & Assignment ............................................................................. 11
Figure 5 2021 No Action Peak Hour Traffic Volumes ................................................................... 12
Figure 6 2021 With-Project Peak Hour Traffic Volumes ................................................................. 13
Table 1 Existing Roadway Network Summary – Project Site Vicinity .................................................. 5
Table 2 LOS Criteria for Signalized and Stop-Controlled Intersections1 .............................................. 7
Table 3 2017 Existing Peak Hour LOS Summary .......................................................................... 8
Table 4 Collision Data Summary, January 1, 2014 to December 31, 2016 ...................................... 8
Table 5 Trip Generation Summary ............................................................................................ 10
Table 6 Project Trip Distribution................................................................................................ 10
Table 7 Year 2021 Peak Hour Level of Service Summary ............................................................. 14
Transportation Impact Analysis
Forest Terrace Preliminary Plat
TENW December 14, 2017
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FINDINGS/CONCLUSIONS
This traffic impact analysis (TIA) has been prepared for the proposed Forest Terrace Preliminary Plat
project located on the west side of Union Avenue NE in the vicinity of NE 27th Place in Renton, WA.
Project Proposal. The proposed Forest Terrace Preliminary Plat project includes the development of
25 detached single-family lots. The existing site includes one single-family home, which will be
removed with the proposed project. Vehicular access to the site will be provided to Union Avenue
NE by a proposed road that would align with the existing NE 27th Place. Project buildout is expected
by 2021.
Trip Generation. The proposed project is estimated to generate 281 net new weekday daily trips
with 22 net new trips occurring during the weekday AM peak hour (6 in, 16 out) and 26 net new
trips occurring during the weekday PM peak hour (16 in, 10 out). The trip generation reflects credit
for the existing home that will be removed.
Future Year LOS. LOS analyses were conducted for future year 2021 AM and PM peak hour
conditions at the Union Avenue NE/NE 27th Place study intersection. Based on the analysis results,
all controlled movements are expected to operate at LOS B or better in 2021 with the proposed Forest
Terrace Preliminary Plat project.
Mitigation
Off-Site Improvements. Based on the results of the LOS analysis, no project-specific off-site
transportation mitigation is proposed.
Transportation Impact Fees. To mitigate long-term traffic impacts, the City of Renton requires
payment of a traffic impact fee. The CityÊs currently adopted 2017 impact fee rate is $5,430.85
per single family house. Based on the current proposed lot count and credit for the existing home
to removed, the net transportation impact fee for the proposed project would be $130,340.40.
The CityÊs transportation impact fee rate is subject to change.
Transportation Impact Analysis
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TENW December 14, 2017
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INTRODUCTION
This traffic impact analysis (TIA) has been prepared for the proposed Forest Terrace Preliminary Plat
project located on the west side of Union Avenue NE in the vicinity of NE 27th Place as shown in
the Figure 1 Vicinity Map.
Project Description
The proposed Forest Terrace Preliminary Plat project would include the development 25 detached
single-family lots. The existing site includes one single-family home, which will be removed with the
proposed project. Vehicular access will be provided to Union Avenue NE by a proposed road that
would align with the existing NE 27th Place. Full buildout of the project is expected by 2021. An
analysis year of 2021 was used for this study. A preliminary site plan is provided in Figure 2.
Project Approach
To analyze the traffic impacts from the project, the following tasks were undertaken:
• Assessed existing conditions through field reconnaissance and reviewed existing
planning documents;
• Described and assessed existing transportation conditions in the area;
• Documented collision histories at study intersections;
• Documented planned transportation improvements in the site vicinity;
• Documented existing traffic volumes and intersection levels of service (LOS) at the
Union Avenue NE/NE 27th Place study intersection during the weekday AM and
PM peak hours;
• Estimated trip generation and documented trip distribution and assignment of
weekday daily, AM and PM peak hour project-generated traffic;
• Documented traffic forecasts and assumptions for year 2021 conditions at the study
intersection without and with the proposed development;
• Analyzed weekday AM and PM peak hour LOS for year 2021 conditions at the
study intersection without and with the proposed development;
• Identified transportation mitigation to the City of Renton.
Primary Data and Information Sources
• City of Renton Comprehensive Plan Transportation Element, June 22, 2015.
• City of Renton 2018 - 2023 Transportation Improvement Program.
• ITE Trip Generation Manual, 10th edition, 2017.
• AM and PM Peak Hour traffic counts by All Traffic Data, June 2017.
• Highway Capacity Manual (HCM 6th Edition), 2016.
• Washington State Department of Transportation (WSDOT) Collision Data, 2014-
2016.
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TENW December 14, 2017
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Figure 1 Project Site Vicinity
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Figure 2 Preliminary Site Plan
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EXISTING CONDITIONS
Roadway Network
The primary travel route to and from the site in the City of Renton includes Union Ave NE. A
description of this roadway is included in Table 1 below.
Table 1
Existing Roadway Network Summary – Project Site Vicinity
Roadway Orientation Classification
Speed
Limit
Number
of Lanes
Street
Parking
Edge
Condition
Union Ave NE N-S Minor Arterial 35 2 None Paved
Shoulder
Existing Traffic Volumes
Existing weekday AM and PM peak hour traffic volumes at the Union Ave NE / NE 27th Place study
intersection were based on counts conducted by All Traffic Data in June 2017. Figure 3 illustrates
the 2017 existing AM and PM peak hour traffic volumes at the study intersection. The detailed peak
hour turning movement count sheets are provided in Appendix A.
Public Transportation Services
Public transportation in the project vicinity is served by King County Metro Transit. The Renton Bible
Church Park & Ride lot located at 973 Union Ave NE is approximately 1 mile south of the project
site. The existing park & ride lot includes 50 parking stalls and provides access to King County
Metro Transit routes 105 and 114. Transit routes 105 and 114 provide service to downtown Renton
and downtown Seattle.
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Figure 3 Year 2017 Existing Peak Hour Traffic Volumes
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Level of Service
Level of service (LOS) analyses were conducted at the Union Ave NE/NE 27th Place study
intersection.
LOS generally refers to the degree of congestion on a roadway or intersection. It is a measure of
vehicle operating speed, travel time, travel delays, and driving comfort. A letter scale from A to F
generally describes intersection LOS. At signalized intersections, LOS A represents free-flow
conditions (motorists experience little or no delays), and LOS F represents forced-flow conditions
where motorists experience an average delay in excess of 80 seconds per vehicle.
The LOS reported at stop-controlled intersections is based on the average control delay and can be
reported for each controlled minor approach, controlled minor lane group, and controlled major-
street movement (and for the overall intersection at all-way stop controlled intersections. Additional
v/c ratio criteria apply to lane group or movement LOS only). Table 2 outlines the current HCM 6th
Edition LOS criteria for signalized and stop-controlled intersections based on these methodologies.
Table 2
LOS Criteria for Signalized and Stop-Controlled Intersections1
SIGNALIZED INTERSECTIONS STOP-CONTROLLED INTERSECTIONS
LOS by Volume-to
Capacity (V/C) Ratio2
LOS by Volume-to
Capacity (V/C) Ratio3
Control Delay
(sec/veh) £ 1.0 > 1.0
Control Delay
(sec/veh) £ 1.0 > 1.0
£ 10 A F £ 10 A F
> 10 to £ 20 B F > 10 to £ 15 B F
> 20 to £ 35 C F > 15 to £ 25 C F
> 35 to £ 55 D F > 25 to £ 35 D F
> 55 to £ 80 E F > 35 to £ 50 E F
> 80 F F > 50 F F
1 Source: Highway Capacity Manual (6th Edition), Transportation Research Board, 2016.
2 For approach-based and intersection-wide assessments at signals, LOS is defined solely by control delay.
3 For two-way stop controlled intersections, the LOS criteria apply to each lane on a given approach and to each approach
on the minor street. LOS is not calculated for major-street approaches or for the intersection as a whole at two-way stop
controlled intersections. For approach-based and intersection-wide assessments at all-way stop controlled intersections,
LOS is solely defined by control delay.
Level of service calculations for intersections were based on methodology and procedures outlined
in the latest Highway Capacity Manual (6th Edition) using Synchro 10.1 traffic analysis software.
The 2017 existing AM and PM peak hour LOS analysis results for the Union Ave NE / NE 27th
Place study intersection are summarized in Table 3. The 2017 existing LOS worksheets are included
in Appendix B.
Transportation Impact Analysis
Forest Terrace Preliminary Plat
TENW December 14, 2017
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Table 3
2017 Existing Peak Hour LOS Summary
Time Period / Study Intersection LOS
Delay
(sec)
AM Peak Hour
1. Union Ave NE / NE 27th Place
Westbound Shared Left- Right B 10.3
Southbound Left-Turn A 0.0
PM Peak Hour
1. Union Ave NE / NE 27th Place
Westbound Shared Left- Right A 9.9
Southbound Left-Turn A 7.5
As shown in Table 3, the controlled movements at the study intersection currently operate at LOS B
or better.
Collision History
Historic collisions at the study intersections were analyzed for the three-year period from 2014 to
2016. Collision data was provided by WSDOT. Summaries of the total and yearly average
collisions during this period are provided in Table 4.
Table 4
Collision Data Summary, January 1, 2014 to December 31, 2016
Location 2014 2015 2016
Three-Year
Total
Collisions
Average
Annual
Collisions
Intersection
Union Ave NE / NE 27th Place 0 0 0 0 0.00
Segment
Union Ave NE between
SE 95th Way and NE 25th Pl 2 0 0 2 0.67
Source: WSDOT Collision Records.
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TENW December 14, 2017
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FUTURE TRAFFIC CONDITIONS
Planned Transportation Improvements
This section documents the known planned transportation improvements in the study area. There is
one planned transportation improvement project identified in the City of RentonÊs adopted 2018-
2023 Transportation Improvement Program (TIP) in the project vicinity.
• TIP #15 NE Sunset Boulevard (SR 900) Corridor Improvements
Description:
This project will seek to address pedestrian, transit and bicycle needs. This corridor needs
a series of key improvements to improve traffic operations such as channelization, traffic
signal modifications, signal treatments, possible queue jumps, access management through
installation of medians. The corridor limits are from I-405 on the west and to the east City
limits. Total project cost is $33,125,833.
Transportation Impact Analysis
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TENW December 14, 2017
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Project Trip Generation
The weekday daily, AM and PM peak hour trip generation estimates for the existing and future single-
family homes were based on trip rates published in the Institute of Transportation Engineers (ITE) Trip
Generation manual, 10th edition. The resulting weekday daily, AM and PM peak hour trips are
summarized in Table 5.
Table 5
Trip Generation Summary
Net New Trips Generated
Weekday Time Period In Out Total
Weekday Daily 141 140 281
Weekday AM Peak Hour 6 16 22
Weekday PM Peak Hour 16 10 26
As shown in Table 5, the proposed project is estimated to generate 281 net new weekday daily
trips, with 22 net new trips occurring during the weekday AM peak hour (6 entering, 16 exiting),
and 26 net new trips occurring during the weekday PM peak hour (16 entering, 10 exiting). Detailed
trip generation calculations are included in Attachment C.
Project Trip Distribution and Assignment
The distribution and assignment of the net new AM and PM peak hour project trips were estimated
based existing travel patterns, and confirmed by City of Renton staff as part of the Traffic Scoping for
the project. The following Table 6 summarizes the resulting general trip distribution patterns.
Table 6
Project Trip Distribution
Route (Direction) Trip Distribution
Union Ave NE (north) 25%
Union Ave NE (south) 75%
TOTAL 100%
The project trip distribution and assignment through the study intersection is shown in Figure 4.
Future Traffic Volumes
Year 2021 No Action (without project) peak hour traffic volumes were estimated by applying a 2
percent annual background growth rate to the existing volumes (confirmed by City as part of Traffic
Scoping). No pipeline projects were identified by the City of Renton, King County, or the City of
Newcastle in the project vicinity.
The resulting future 2021 No Action AM and PM peak hour traffic volumes are shown in Figure 5.
The 2021 With-Project traffic volumes were determined by adding the trip assignment from the
proposed development (shown in Figure 4) to the future 2021 No Action traffic volumes. The resulting
2021 With-Project AM and PM peak hour traffic volumes at the study intersection are shown in Figure
6.
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Figure 4 Project Trip Distribution & Assignment
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Figure 5 2021 No Action Peak Hour Traffic Volumes
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Figure 6 2021 With-Project Peak Hour Traffic Volumes
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Future Level of Service
Future year 2021 Level of Service (LOS) analyses were conducted at the Union Ave NE / NE 27th
Place study intersection for year 2021 weekday AM and PM peak hour No Action (without project)
conditions and for year 2021 With-Project conditions. The future 2021 with-Project conditions at
the Union Ave NE/NE 27th Street intersection includes a west leg to the intersection which would
provide access to the site.
The 2021 weekday AM and PM peak hour LOS results at the study intersections without and with
the proposed project are summarized in Table 7. The LOS worksheets are included in Appendix C.
Table 7
Year 2021 Peak Hour Level of Service Summary
2021 No Action 2021 With-Project
Time Period / Study Intersection (movement)LOS
Delay
(sec) LOS
Delay
(sec)
AM Peak Hour
1. Union Ave NE / NE 27th Place
Northbound Left-Turn - - A 7.3
Eastbound Shared Left-Thru-Right - - A 9.2
Westbound Shared Left-Thru-Right B 10.5 B 11.1
Southbound Left-Turn A 0.0 A 0.0
PM Peak Hour
1. Union Ave NE / NE 27th Place
Northbound Left-Turn - - A 7.7
Eastbound Shared Left-Thru-Right - - A 9.9
Westbound Shared Left-Thru-Right B 10.0 B 10.4
Southbound Left-Turn A 7.5 A 7.5
1. Results based on HCM Methodologies (6th Edition).
As shown in Table 7, the controlled movements at the study intersection are expected to operate at
acceptable levels (LOS B or better) in the future with the project during the weekday AM and PM
peak hours.
MITIGATION
Off-Site Improvements. Based on the results of the LOS analysis shown in this report, no project-
specific off-site transportation mitigation is proposed.
Transportation Impact Fees. To mitigate long-term traffic impacts, the City of Renton requires payment
of a traffic impact fee. The CityÊs currently adopted 2017 impact fee rate is $5,430.85 per single
family house. Based on the current proposed lot count and credit for the existing home to removed,
the net transportation impact fee for the proposed project would be $130,340.40. The CityÊs
transportation impact fee rate is subject to change.
Transportation Impact Analysis
Forest Terrace Preliminary Plat
Appendix A
Peak Hour Turning Movement Counts
Transportation Impact Analysis
Forest Terrace Preliminary Plat
Appendix B
Level of Service (LOS) Calculations
Transportation Impact Analysis
Forest Terrace Preliminary Plat
2017 Existing
Lanes, Volumes, Timings
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2017 Existing - AM Peak Hour
Lane Group WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Volume (vph) 5 0 247 1 0 38
Future Volume (vph) 5 0 247 1 0 38
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900
Grade (%) 0% -11% 11%
Link Speed (mph) 25 30 30
Link Distance (ft) 262 298 294
Travel Time (s) 7.1 6.8 6.7
Peak Hour Factor 0.92 0.92 0.92 0.92 0.92 0.92
Heavy Vehicles (%) 0% 0% 4% 4% 0% 0%
Shared Lane Traffic (%)
Sign Control Stop Free Free
Intersection Summary
Area Type: Other
Control Type: Unsignalized
HCM 6th TWSC
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2017 Existing - AM Peak Hour
Intersection
Int Delay, s/veh 0.2
Movement WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Vol, veh/h 5 0 247 1 0 38
Future Vol, veh/h 5 0 247 1 0 38
Conflicting Peds, #/hr 0 0 0 0 0 0
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 - - - - -
Veh in Median Storage, # 0 - 0 - - 0
Grade, % 0 - -11 - - 11
Peak Hour Factor 92 92 92 92 92 92
Heavy Vehicles, % 0 0 4 4 0 0
Mvmt Flow 5 0 268 1 0 41
Major/Minor Minor1 Major1 Major2
Conflicting Flow All 310 269 0 0 269 0
Stage 1 269 - - - - -
Stage 2 41 - - - - -
Critical Hdwy 6.4 6.2 - - 4.1 -
Critical Hdwy Stg 1 5.4 - - - - -
Critical Hdwy Stg 2 5.4 - - - - -
Follow-up Hdwy 3.5 3.3 - - 2.2 -
Pot Cap-1 Maneuver 687 775 - - 1306 -
Stage 1 781 - - - - -
Stage 2 987 - - - - -
Platoon blocked, % - - -
Mov Cap-1 Maneuver 687 775 - - 1306 -
Mov Cap-2 Maneuver 687 - - - - -
Stage 1 781 - - - - -
Stage 2 987 - - - - -
Approach WB NB SB
HCM Control Delay, s 10.3 0 0
HCM LOS B
Minor Lane/Major Mvmt NBT NBRWBLn1 SBL SBT
Capacity (veh/h) - - 687 1306 -
HCM Lane V/C Ratio - - 0.008 - -
HCM Control Delay (s) - - 10.3 0 -
HCM Lane LOS - - B A -
HCM 95th %tile Q(veh) - - 0 0 -
Lanes, Volumes, Timings
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2017 Existing - PM Peak Hour
Lane Group WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Volume (vph) 1 2 123 7 5 197
Future Volume (vph) 1 2 123 7 5 197
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900
Grade (%) 0% -11% 11%
Link Speed (mph) 25 30 30
Link Distance (ft) 262 298 294
Travel Time (s) 7.1 6.8 6.7
Peak Hour Factor 0.95 0.95 0.95 0.95 0.95 0.95
Heavy Vehicles (%) 33% 33% 1% 1% 1% 1%
Shared Lane Traffic (%)
Sign Control Stop Free Free
Intersection Summary
Area Type: Other
Control Type: Unsignalized
HCM 6th TWSC
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2017 Existing - PM Peak Hour
Intersection
Int Delay, s/veh 0.2
Movement WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Vol, veh/h 1 2 123 7 5 197
Future Vol, veh/h 1 2 123 7 5 197
Conflicting Peds, #/hr 0 0 0 0 0 0
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 - - - - -
Veh in Median Storage, # 0 - 0 - - 0
Grade, % 0 - -11 - - 11
Peak Hour Factor 95 95 95 95 95 95
Heavy Vehicles, % 33 33 1 1 1 1
Mvmt Flow 1 2 129 7 5 207
Major/Minor Minor1 Major1 Major2
Conflicting Flow All 350 133 0 0 136 0
Stage 1 133 - - - - -
Stage 2 217 - - - - -
Critical Hdwy 6.73 6.53 - - 4.11 -
Critical Hdwy Stg 1 5.73 - - - - -
Critical Hdwy Stg 2 5.73 - - - - -
Follow-up Hdwy 3.797 3.597 - - 2.209 -
Pot Cap-1 Maneuver 589 840 - - 1454 -
Stage 1 822 - - - - -
Stage 2 751 - - - - -
Platoon blocked, % - - -
Mov Cap-1 Maneuver 587 840 - - 1454 -
Mov Cap-2 Maneuver 587 - - - - -
Stage 1 819 - - - - -
Stage 2 751 - - - - -
Approach WB NB SB
HCM Control Delay, s 9.9 0 0.2
HCM LOS A
Minor Lane/Major Mvmt NBT NBRWBLn1 SBL SBT
Capacity (veh/h) - - 734 1454 -
HCM Lane V/C Ratio - - 0.004 0.004 -
HCM Control Delay (s) - - 9.9 7.5 0
HCM Lane LOS - - A A A
HCM 95th %tile Q(veh) - - 0 0 -
Transportation Impact Analysis
Forest Terrace Preliminary Plat
2021 No Action
Lanes, Volumes, Timings
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 Baseline - AM Peak Hour
Lane Group WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Volume (vph) 5 0 267 1 0 41
Future Volume (vph) 5 0 267 1 0 41
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900
Grade (%) 0% -11% 11%
Link Speed (mph) 25 30 30
Link Distance (ft) 262 298 294
Travel Time (s) 7.1 6.8 6.7
Peak Hour Factor 0.92 0.92 0.92 0.92 0.92 0.92
Heavy Vehicles (%) 0% 0% 4% 4% 0% 0%
Shared Lane Traffic (%)
Sign Control Stop Free Free
Intersection Summary
Area Type: Other
Control Type: Unsignalized
HCM 6th TWSC
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 Baseline - AM Peak Hour
Intersection
Int Delay, s/veh 0.2
Movement WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Vol, veh/h 5 0 267 1 0 41
Future Vol, veh/h 5 0 267 1 0 41
Conflicting Peds, #/hr 0 0 0 0 0 0
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 - - - - -
Veh in Median Storage, # 0 - 0 - - 0
Grade, % 0 - -11 - - 11
Peak Hour Factor 92 92 92 92 92 92
Heavy Vehicles, % 0 0 4 4 0 0
Mvmt Flow 5 0 290 1 0 45
Major/Minor Minor1 Major1 Major2
Conflicting Flow All 336 291 0 0 291 0
Stage 1 291 - - - - -
Stage 2 45 - - - - -
Critical Hdwy 6.4 6.2 - - 4.1 -
Critical Hdwy Stg 1 5.4 - - - - -
Critical Hdwy Stg 2 5.4 - - - - -
Follow-up Hdwy 3.5 3.3 - - 2.2 -
Pot Cap-1 Maneuver 663 753 - - 1282 -
Stage 1 763 - - - - -
Stage 2 983 - - - - -
Platoon blocked, % - - -
Mov Cap-1 Maneuver 663 753 - - 1282 -
Mov Cap-2 Maneuver 663 - - - - -
Stage 1 763 - - - - -
Stage 2 983 - - - - -
Approach WB NB SB
HCM Control Delay, s 10.5 0 0
HCM LOS B
Minor Lane/Major Mvmt NBT NBRWBLn1 SBL SBT
Capacity (veh/h) - - 663 1282 -
HCM Lane V/C Ratio - - 0.008 - -
HCM Control Delay (s) - - 10.5 0 -
HCM Lane LOS - - B A -
HCM 95th %tile Q(veh) - - 0 0 -
Lanes, Volumes, Timings
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 Baseline - PM Peak Hour
Lane Group WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Volume (vph) 1 2 133 8 5 213
Future Volume (vph) 1 2 133 8 5 213
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900
Grade (%) 0% -11% 11%
Link Speed (mph) 25 30 30
Link Distance (ft) 262 298 294
Travel Time (s) 7.1 6.8 6.7
Peak Hour Factor 0.95 0.95 0.95 0.95 0.95 0.95
Heavy Vehicles (%) 33% 33% 1% 1% 1% 1%
Shared Lane Traffic (%)
Sign Control Stop Free Free
Intersection Summary
Area Type: Other
Control Type: Unsignalized
HCM 6th TWSC
1: Union Ave NE & NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 Baseline - PM Peak Hour
Intersection
Int Delay, s/veh 0.2
Movement WBL WBR NBT NBR SBL SBT
Lane Configurations
Traffic Vol, veh/h 1 2 133 8 5 213
Future Vol, veh/h 1 2 133 8 5 213
Conflicting Peds, #/hr 0 0 0 0 0 0
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 - - - - -
Veh in Median Storage, # 0 - 0 - - 0
Grade, % 0 - -11 - - 11
Peak Hour Factor 95 95 95 95 95 95
Heavy Vehicles, % 33 33 1 1 1 1
Mvmt Flow 1 2 140 8 5 224
Major/Minor Minor1 Major1 Major2
Conflicting Flow All 378 144 0 0 148 0
Stage 1 144 - - - - -
Stage 2 234 - - - - -
Critical Hdwy 6.73 6.53 - - 4.11 -
Critical Hdwy Stg 1 5.73 - - - - -
Critical Hdwy Stg 2 5.73 - - - - -
Follow-up Hdwy 3.797 3.597 - - 2.209 -
Pot Cap-1 Maneuver 567 828 - - 1440 -
Stage 1 813 - - - - -
Stage 2 737 - - - - -
Platoon blocked, % - - -
Mov Cap-1 Maneuver 565 828 - - 1440 -
Mov Cap-2 Maneuver 565 - - - - -
Stage 1 810 - - - - -
Stage 2 737 - - - - -
Approach WB NB SB
HCM Control Delay, s 10 0 0.2
HCM LOS B
Minor Lane/Major Mvmt NBT NBRWBLn1 SBL SBT
Capacity (veh/h) - - 717 1440 -
HCM Lane V/C Ratio - - 0.004 0.004 -
HCM Control Delay (s) - - 10 7.5 0
HCM Lane LOS - - B A A
HCM 95th %tile Q(veh) - - 0 0 -
Transportation Impact Analysis
Forest Terrace Preliminary Plat
2021 With-Project
Lanes, Volumes, Timings
1: Union Ave NE & Site Access/NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 With-Project - AM Peak Hour
Lane Group EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Traffic Volume (vph) 4 0 12 5 0 0 5 267 1 0 41 1
Future Volume (vph) 4 0 12 5 0 0 5 267 1 0 41 1
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900
Grade (%) 0% 0% -11% 11%
Link Speed (mph) 25 25 30 30
Link Distance (ft) 234 262 298 294
Travel Time (s) 6.4 7.1 6.8 6.7
Peak Hour Factor 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92
Heavy Vehicles (%) 2% 2% 2% 0% 0% 0% 4% 4% 4% 0% 0% 0%
Shared Lane Traffic (%)
Sign Control Stop Stop Free Free
Intersection Summary
Area Type: Other
Control Type: Unsignalized
HCM 6th TWSC
1: Union Ave NE & Site Access/NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 With-Project - AM Peak Hour
Intersection
Int Delay, s/veh 0.7
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Traffic Vol, veh/h 4 0 12 5 0 0 5 267 1 0 41 1
Future Vol, veh/h 4 0 12 5 0 0 5 267 1 0 41 1
Conflicting Peds, #/hr 0 0 0 0 0 0 0 0 0 0 0 0
Sign Control Stop Stop Stop Stop Stop Stop Free Free Free Free Free Free
RT Channelized - - None - - None - - None - - None
Storage Length - - - - - - - - - - - -
Veh in Median Storage, # - 0 - - 0 - - 0 - - 0 -
Grade, % - 0 - - 0 - - -11 - - 11 -
Peak Hour Factor 92 92 92 92 92 92 92 92 92 92 92 92
Heavy Vehicles, % 2 2 2 0 0 0 4 4 4 0 0 0
Mvmt Flow 4 0 13 5 0 0 5 290 1 0 45 1
Major/Minor Minor2 Minor1 Major1 Major2
Conflicting Flow All 347 347 46 353 347 291 46 0 0 291 0 0
Stage 1 46 46 - 301 301 - - - - - - -
Stage 2 301 301 - 52 46 - - - - - - -
Critical Hdwy 7.12 6.52 6.22 7.1 6.5 6.2 4.14 - - 4.1 - -
Critical Hdwy Stg 1 6.12 5.52 - 6.1 5.5 - - - - - - -
Critical Hdwy Stg 2 6.12 5.52 - 6.1 5.5 - - - - - - -
Follow-up Hdwy 3.518 4.018 3.318 3.5 4 3.3 2.236 - - 2.2 - -
Pot Cap-1 Maneuver 607 576 1023 606 580 753 1549 - - 1282 - -
Stage 1 968 857 - 712 669 - - - - - - -
Stage 2 708 665 - 966 861 - - - - - - -
Platoon blocked, %- - - -
Mov Cap-1 Maneuver 605 574 1023 596 578 753 1549 - - 1282 - -
Mov Cap-2 Maneuver 605 574 - 596 578 - - - - - - -
Stage 1 964 857 - 709 666 - - - - - - -
Stage 2 705 662 - 954 861 - - - - - - -
Approach EB WB NB SB
HCM Control Delay, s 9.2 11.1 0.1 0
HCM LOS A B
Minor Lane/Major Mvmt NBL NBT NBR EBLn1WBLn1 SBL SBT SBR
Capacity (veh/h) 1549 - - 872 596 1282 - -
HCM Lane V/C Ratio 0.004 - - 0.02 0.009 - - -
HCM Control Delay (s) 7.3 0 - 9.2 11.1 0 - -
HCM Lane LOS A A - A B A - -
HCM 95th %tile Q(veh) 0 - - 0.1 0 0 - -
Lanes, Volumes, Timings
1: Union Ave NE & Site Access/NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 With-Project - PM Peak Hour
Lane Group EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Traffic Volume (vph) 2 0 8 1 0 2 12 133 8 5 213 4
Future Volume (vph) 2 0 8 1 0 2 12 133 8 5 213 4
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900
Grade (%) 0% 0% -11% 11%
Link Speed (mph) 25 25 30 30
Link Distance (ft) 250 262 298 294
Travel Time (s) 6.8 7.1 6.8 6.7
Peak Hour Factor 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95
Heavy Vehicles (%) 2% 2% 2% 33% 33% 33% 1% 1% 1% 1% 1% 1%
Shared Lane Traffic (%)
Sign Control Stop Stop Free Free
Intersection Summary
Area Type: Other
Control Type: Unsignalized
HCM 6th TWSC
1: Union Ave NE & Site Access/NE 27th Place 12/14/2017
Forest Terrace Preliminary Plat Synchro 10 Report
2021 With-Project - PM Peak Hour
Intersection
Int Delay, s/veh 0.7
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Traffic Vol, veh/h 2 0 8 1 0 2 12 133 8 5 213 4
Future Vol, veh/h 2 0 8 1 0 2 12 133 8 5 213 4
Conflicting Peds, #/hr 0 0 0 0 0 0 0 0 0 0 0 0
Sign Control Stop Stop Stop Stop Stop Stop Free Free Free Free Free Free
RT Channelized - - None - - None - - None - - None
Storage Length - - - - - - - - - - - -
Veh in Median Storage, # - 0 - - 0 - - 0 - - 0 -
Grade, % - 0 - - 0 - - -11 - - 11 -
Peak Hour Factor 95 95 95 95 95 95 95 95 95 95 95 95
Heavy Vehicles, % 2 2 2 33 33 33 1 1 1 1 1 1
Mvmt Flow 2 0 8 1 0 2 13 140 8 5 224 4
Major/Minor Minor2 Minor1 Major1 Major2
Conflicting Flow All 407 410 226 410 408 144 228 0 0 148 0 0
Stage 1 236 236 - 170 170 - - - - - - -
Stage 2 171 174 - 240 238 - - - - - - -
Critical Hdwy 7.12 6.52 6.22 7.43 6.83 6.53 4.11 - - 4.11 - -
Critical Hdwy Stg 1 6.12 5.52 - 6.43 5.83 - - - - - - -
Critical Hdwy Stg 2 6.12 5.52 - 6.43 5.83 - - - - - - -
Follow-up Hdwy 3.518 4.018 3.318 3.797 4.297 3.597 2.209 - - 2.209 - -
Pot Cap-1 Maneuver 555 531 813 501 488 828 1346 - - 1440 - -
Stage 1 767 710 - 764 703 - - - - - - -
Stage 2 831 755 - 699 655 - - - - - - -
Platoon blocked, %- - - -
Mov Cap-1 Maneuver 547 523 813 490 481 828 1346 - - 1440 - -
Mov Cap-2 Maneuver 547 523 - 490 481 - - - - - - -
Stage 1 759 707 - 756 695 - - - - - - -
Stage 2 820 747 - 689 652 - - - - - - -
Approach EB WB NB SB
HCM Control Delay, s 9.9 10.4 0.6 0.2
HCM LOS A B
Minor Lane/Major Mvmt NBL NBT NBR EBLn1WBLn1 SBL SBT SBR
Capacity (veh/h) 1346 - - 741 673 1440 - -
HCM Lane V/C Ratio 0.009 - - 0.014 0.005 0.004 - -
HCM Control Delay (s) 7.7 0 - 9.9 10.4 7.5 0 -
HCM Lane LOS A A - A B A A -
HCM 95th %tile Q(veh) 0 - - 0 0 0 - -
Transportation Impact Analysis
Forest Terrace Preliminary Plat
Appendix C
Trip Generation Calculations
ITE Trip Rate
Land Use Units LUC
1 In Out Total In Out Total
Weekday Daily
Proposed Use
Single-Family 25 Dwelling Units 210 50%50%Equation 145 145 290
Less Existing Use
Single-Family 1 Dwelling Units 210 50%50%9.44 -4 -5 -9
Total Net New Weekday Daily Trips Generated = 141 140 281
Weekday AM Peak Hour
Proposed Use
Single-Family 25 Dwelling Units 210 25%75%Equation 6 17 23
Less Existing Use
Single-Family 1 Dwelling Units 210 25%75%0.74 0 -1 -1
Total Net New AM Peak Hour Trips Generated = 6 16 22
Weekday PM Peak Hour
Proposed Use
Single-Family 25 Dwelling Units 210 63%37%Equation 17 10 27
Less Existing Use
Single-Family 1 Dwelling Units 210 63%37%0.99 -1 0 -1
Total Net New PM Peak Hour Trips Generated = 16 10 26
Note:
1 Institute of Transportation Engineers, Trip Generation Manual, 10th Edition, 2017 Land Use Code.
Directional Split Trips Generated