CC - Traffic Impact Study - 5.19Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
Page i
Table of Contents
EXECUTIVE SUMMARY .......................................................................................................................... 1
Introduction .............................................................................................................................................. 1
Proposed Development ............................................................................................................................. 1
Study Area ................................................................................................................................................ 1
Conclusions .............................................................................................................................................. 1
INTRODUCTION ........................................................................................................................................ 2
PROPOSED DEVELOPMENT .................................................................................................................... 3
STUDY AREA CONDITIONS .................................................................................................................... 3
Study Area ................................................................................................................................................ 3
Land Use ................................................................................................................................................... 3
STUDY PERIOD .......................................................................................................................................... 4
Build Out Year.......................................................................................................................................... 4
Time Period .............................................................................................................................................. 4
EXISTING CONDITIONS ........................................................................................................................... 4
Road System ............................................................................................................................................. 4
System Improvements .............................................................................................................................. 4
Traffic Volumes ........................................................................................................................................ 4
Accident Analysis ..................................................................................................................................... 6
PROJECTED TRAFFIC ............................................................................................................................... 6
Background Traffic ................................................................................................................................... 6
Off Site Traffic ......................................................................................................................................... 6
Trip Generation......................................................................................................................................... 8
Trip Distribution ....................................................................................................................................... 8
Site Traffic ................................................................................................................................................ 9
Total Traffic ............................................................................................................................................ 10
TRAFFIC ANALYSIS ............................................................................................................................... 11
Capacity Analysis and Level of Service ................................................................................................. 11
Intersection Analysis .............................................................................................................................. 11
Roadway Analysis .................................................................................................................................. 12
Site Access .............................................................................................................................................. 12
DISCUSSIONS ........................................................................................................................................... 12
Approved Land Use ................................................................................................................................ 12
Roadway Improvements ......................................................................................................................... 13
Required Due to Existing Traffic Conditions ..................................................................................... 13
Required Due to Background Traffic Conditions .............................................................................. 13
Required Due to Total Traffic Conditions ......................................................................................... 13
Combined Entrance ................................................................................................................................ 14
CONCLUSIONS......................................................................................................................................... 14
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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List of Figures
Figure 1 - Project Location ........................................................................................................................... 2
Figure 2 - Preliminary Site Plan .................................................................................................................... 3
Figure 3 - Existing AM Peak Hour Conditions ............................................................................................. 5
Figure 4 - Existing PM Peak Hour Conditions ............................................................................................. 5
Figure 5 - Build Out Year AM Peak Hour Background Traffic ................................................................... 7
Figure 6 - Build Out Year PM Peak Hour Background Traffic .................................................................... 7
Figure 7 - Trip Distribution ........................................................................................................................... 8
Figure 8 - AM Peak Hour Site Traffic ......................................................................................................... 9
Figure 9 - PM Peak Hour Site Traffic ........................................................................................................... 9
Figure 10 - Build Out Year Total AM Peak Hour Traffic .......................................................................... 10
Figure 11 - Build Out Year Total PM Peak Hour Traffic ........................................................................... 10
Figure 12 - Trip Generatation of Office Development ............................................................................... 13
List of Tables
Table 1 – Accident Data for Goddard Creek Way and McMillan Road 2011-2015..................................... 6
Table 2 - Intersection Traffic Data ................................................................................................................ 6
Table 3 - Trip Generation ............................................................................................................................. 8
Table 4 - AM Peak Hour Intersection Analysis Summary ......................................................................... 11
Table 5 - PM Peak Hour Intersection Analysis Summary .......................................................................... 11
Table 6 - Roadway Segment Analysis ........................................................................................................ 12
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
Page 1
EXECUTIVE SUMMARY
Introduction
Thompson Engineers, Inc. has been retained to prepare a traffic impact study for the
proposed Goddard Creek Subdivision in Meridian, Idaho. The project is located near the
intersection of McMillan Road and Goddard Creek Road, approximately as shown in
Figure 1 in the main body of this report.
This report has been prepared in conformance with the recommended practices of the
Institute of Transportation Engineers.
Proposed Development
The project is a mixed use development of approximately 74 units of four plex and 6.01
acres of self storage. The preliminary plat was not finalized at the time of this report.
The four plexes are expected to access the transportation system through Goddard Creek
Way via Apgar Creek Lane. Apgar Creek Lane is a private lane. The storage units will
access McMillan Road directly.
The site is within the Meridian City Limits.
Study Area
The area of influence is anticipated to be Ada County, Idaho, including the City of
Meridian. The primary impacts will be along McMillan Road and Goddard Creek Way.
The study area will include the intersections of McMillan Road and Goddard Creek Way
and Goddard Creek Way and Apgar Creek Lane.
Conclusions
Below are the findings of this report:
Based on the trip generation methods recommended in the Trip Generation Manual,
the site will generate 705 trips per day, of which 54 trips will occur during the AM
peak hour and 68 trips will occur during the PM peak hour. The four plexes will
generate 492 of the daily trips, 38 of the AM peak hour trips, and 46 of the PM peak
hour trips.
If the site is developed as office space, the site is estimated to generate 1340 daily
trips, 207 AM peak hour trips, and 200 PM peak hour trips.
The project will impact the intersections of McMillan Road and Goddard Creek
Way, and Goddard Creek Way and Apgar Creek Lane.
The intersection of McMillan Road and Goddard Creek Way is anticipated to
operate at LOS C under total traffic conditions in the build out year. The critical
peak hour is in the PM peak hour.
The intersection of Goddard Creek Way and Apgar Creek Lane is anticipated to
operate at LOS B under total traffic conditions in the build out year. The critical
peak hour is in the PM peak hour.
Goddard Creek Way is anticipated to operate below the maximum recommended
volume for LOS D under total traffic conditions.
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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INTRODUCTION
Thompson Engineers, Inc. has been retained to prepare a traffic impact study for the
proposed Goddard Creek Subdivision in Meridian, Idaho. The project is located near the
intersection of McMillan Road and Goddard Creek Road, approximately as shown in
Figure 1. The purpose of this study is to evaluate the potential traffic impacts resulting
from the project and make recommendations for mitigation of those impacts. In
particular, the scope of the study includes the following:
Trip generation of the proposed development
Trip distribution and traffic assignment of the site generated traffic
The capacity of the transportation system to support the development
Intersection treatment of the site access points
Figure 1 - Project Location
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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PROPOSED DEVELOPMENT
The project is a mixed use development of approximately 74 four plex units and 6.01
acres of self storage. The preliminary plat was not finalized at the time of this report. A
preliminary site plan is shown in Figure 2. The four plexes are expected to access the
transportation system through Goddard Creek Way via Apgar Creek Lane. Apgar Creek
Lane is a private lane. The storage units will access McMillan Road directly.
Figure 2 - Preliminary Site Plan
STUDY AREA CONDITIONS
Study Area
The area of influence is anticipated to be Ada County, Idaho, including the City of
Meridian. The primary impacts will be along McMillan Road. The study area will
include the intersection of McMillan Road and Goddard Creek Way.
Land Use
The site is within the Meridian City limit and is currently vacant. Existing zoning is for
commercial use.
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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STUDY PERIOD
Build Out Year
The Build out Year for this project is assumed to be 2022 which will allow for full
occupancy. Actual build out of the site will depend on market conditions and project
implementation.
Time Period
AM and PM peak hour conditions will be studied, in accordance with the requirements of
the Ada County Highway District.
EXISTING CONDITIONS
Road System
McMillan Road is classified as a principal arterial roadway in the vicinity of this project.
In front of the project, there is one lane in each direction. East and west of the project,
there is a center left turn lane, including at the intersection with Goddard Creek. In front
of the project there is no curb gutter or sidewalk. There is a posted speed limit of 40
MPH in front of the project.
Goddard Creek Way is unclassified by ACHD but functions as a collector road. In the
vicinity of this project, it has one through lane in each direction, bike lanes, and curb and
gutter on either side of the roadway. There is a posted speed of 20 MPH in front of the
project.
System Improvements
In the ACHD 20 year plan, ACHD has plans to widen McMillan Road to three lanes in
the 2031-2035 planning period. In the vicinity of this project, much of McMillan Road is
already widened to three lanes.
Traffic Volumes
AM (7:00 t0 9:00 AM) and PM (4:00 to 6:00 PM) peak hour traffic counts were obtained
at the intersection of Goddard Creek Way and McMillan Road and Goddard Creek Way
and Apgar Creek Lane the week of May 2, 2017. Existing AM Peak Hour traffic
volumes are shown in Figure 3. Existing PM Peak Hour traffic volumes are shown in
Figure 4.
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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Figure 3 - Existing AM Peak Hour Conditions
Figure 4 - Existing PM Peak Hour Conditions
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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Accident Analysis
Accident data for the intersection of McMillan Road and Goddard Creek Way for the
years 2011 through 2015 was obtained from the LHATC. The full report is included in
the appendix of this report.
Table 1 – Accident Data for Goddard Creek Way and McMillan Road 2011-2015
Fatal Accidents 0
Injury Accidents 0
Property Damage Accidents 3
Total Accidents 3
Contributing factors included failure to yield and speeding. No roadway conditions or
visual obstructions were described as contributing factors.
Daily traffic was obtained from the COMPASS website from 2014. The average daily
traffic was multiplied by 365 to get the annual traffic, multiplied by five to get a five year
total, and divided by 1,000,000 to determine the number of million vehicles entering the
intersection.
Table 2 - Intersection Traffic Data
Roadway Direction ADT
Goddard Creek Way NB 1847
McMillan Road WB 6058
Daily Vehicles Entering 7905
Million vehicles entering per year (MVE) 2.88
Five Year MVE 14.4
With 3 accidents in a five year period, this will average 0.208 accidents per MVE. This
intersection is a multi lane intersection and an undivided road without access control.
This type of roadway is defined as a Type 9 roadway in the ITD Safety Evaluation
Manual. The average accident rate for this type of intersection in an urban setting is 0.53
accidents per million vehicles entering. This accident rate is below the statewide
average. There is no indication of safety problems at this intersection.
PROJECTED TRAFFIC
Background Traffic
Future traffic is obtained by expanding the existing traffic volumes by a growth factor.
A growth factor of 2.0% per year is used. The growth factor is applied to the intersection
of McMillan and Goddard Creek. The area around Apgar Creek and Goddard Creek is
built out so the traffic will not increase due to organic growth. Background AM Peak
Hour traffic for the build out year is shown in Figure 5. Background PM Peak Hour
traffic for the build out year is shown in Figure 6.
Off Site Traffic
No other major projects are under construction or in the approval process in the vicinity
of this project. Other developments are included in the growth factor.
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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Figure 5 - Build Out Year AM Peak Hour Background Traffic
Figure 6 - Build Out Year PM Peak Hour Background Traffic
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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Trip Generation
Site trip generation is estimated using the procedures recommended in the latest edition
of the Trip Generation Manual (9th edition), published by the Institute of Transportation
Engineers. The land use in the trip generation manual that most closely resembles four
plexes is apartments. Site trip generation is obtained by applying the average trip
generation rates obtained from the Manual for each category of land use within the
development. Table 3 shows the trip generation of the site.
Table 3 - Trip Generation
Trip Distribution
In order to determine impacts, the trips generated by the site must be distributed to
destinations throughout Ada County and assigned to the transportation system. The
distribution for this development is based on information obtained from COMPASS. It is
unlikely that any significant volume of traffic will travel east on Apgar Creek Lane. Site
traffic distribution for the development is shown in Figure 7.
Figure 7 - Trip Distribution
Average Weekday Driveway Volumes
Rate Total Rate Num Rate Num
151 Mini Warehouse 6.01 Acres 35.43 213 0%0 0%0
220 Apartment 74 DU 6.65 492 0%0 0%0
Total
Average Weekday AM Peak Hour Driveway Volumes
Enter Exit
Rate Total Rate Num Rate Num Total Rate Total Rate Num Rate Num Total Total
151 Mini Warehouse 6.01 Acres 1.16 7 0%0 0%0 7 1.42 9 0%0 0%0 9 16
220 Apartment 74 DU 0.10 8 0%0 0%0 8 0.41 30 0%0 0%0 30 38
Total 15 0 15 39 0 39 54
Average Weekday PM Peak Hour Driveway Volumes
Enter Exit
Rate Total Rate Num Rate Num Total Rate Total Rate Num Rate Num Total Total
220 Mini Warehouse 6.01 Acres 1.79 11 0%0 0%0 11 1.79 11 0%0 0%0 11 22
220 Apartment 74 DU 0.40 30 0%0 0%0 30 0.22 16 0%0 0%0 16 46
Total 41 0 41 27 0 27 68
Pass ByITE
Code Land Use No.Units 24 hr 2-Way Capture Total
213
492
705 705
ITE
Code Land Use No.Units Enter Pass By Capture Exit
Pass By Capture
Pass By Capture
ITE
Code Land Use No.Units Enter Pass By Capture Exit
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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Site Traffic
Site traffic is distributed at the study intersection in accordance with the distribution from
Figure 7. Figure 8 shows the distribution of site generated traffic for AM peak hour
traffic conditions. Figure 9 shows the distribution of site generated traffic for PM peak
hour conditions.
Figure 8 - AM Peak Hour Site Traffic
Figure 9 - PM Peak Hour Site Traffic
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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Total Traffic
The site traffic is then added to the background traffic as determined above. Figure 10
shows the total traffic at each intersection for AM peak hour conditions. Figure 11
shows the total traffic at each intersection for PM peak hour traffic conditions f or the
build out year of 2022.
Figure 10 - Build Out Year Total AM Peak Hour Traffic
Figure 11 - Build Out Year Total PM Peak Hour Traffic
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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TRAFFIC ANALYSIS
Capacity Analysis and Level of Service
Capacity analysis was performed using the Highway Capacity Software (HCS2010),
based on the 2010 edition of the Highway Capacity Manual. Level of service for stop
controlled intersections is based on the average delay of vehicles traveling through the
intersection. Table 4 shows the AM peak hour intersection. Table 5 shows the PM peak
intersection. Copies of the calculations are included in the appendix of this report.
Table 4 - AM Peak Hour Intersection Analysis Summary
Table 5 - PM Peak Hour Intersection Analysis Summary
Intersection Analysis
The intersection of Goddard Creek Way and McMillan Road will operate at LOS C in the
PM peak hour under build out traffic conditions. All approaches will operate at LOS D
or better.
LOS Summary
AM Peak Hour Conditions
Delay
s/v LOS
Delay
s/v LOS
Delay
s/v LOS
McMillan and Goddard Creek 13.2 B 14.1 B 14.7 B
EB Critical Movement 8.2 A 8.4 A 8.4 A
SB Critical Movement 15.0 B 16.3 C 17 C
Goddard Creek and Apgar 9.7 A 9.7 A 9.9 A
EB Critical Movement 9.7 A 9.7 A 9.9 A
WB Critical Movement 9.3 A 9.3 A 9.5 A
NB Critical Movement 7.6 A 7.6 A 7.5 A
SB Critical Movement 7.3 A 7.3 A 7.3 A
Storage Entrance 12.8 B
Combined Entrance 16.4 C
2017 2022
Existing Background Total
LOS Summary
PM Peak Hour Conditions
Delay
s/v LOS
Delay
s/v LOS
Delay
s/v LOS
McMillan and Goddard Creek 18.2 C 21.6 C 22.6 C
EB Critical Movement 10.1 B 10.6 B 10.9 B
SB Critical Movement 20.6 C 25.2 D 26.8 D
Goddard Creek and Apgar 11.7 B 11.7 B 12.8 B
EB Critical Movement 9.4 A 9.4 A 9.6 A
WB Critical Movement 11.7 B 11.7 B 12.8 B
NB Critical Movement 7.5 A 7.5 A 7.6 A
SB Critical Movement 7.6 A 7.6 A 7.3 A
Storage Entrance 9.6 A
Combined Entrance 17.3 C
2017 2022
Existing Background Total
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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The intersection of Apgar Way and Goddard Creek Way is anticipated to operate at LOS
B in the PM peak hour under both existing and build out conditions. The eastbound
approach will operate at LOS A
The entrance to the storage facility will operate at LOS B in the AM peak hour.
As an alternative to taking access on Apgar Way, all site traffic could access the
transportation system directly on to McMillan Road via a combined access. If all site
traffic is added to one intersection, the combined intersection will operate at LOS C in the
PM peak hour and LOS B in the AM peak hour.
Roadway Analysis
Roadway segments are analyzed under horizon year peak hour traffic in accordance with
Table 2 of the ACHD Development Policy Manual. The results are shown in Table 6.
Table 6 - Roadway Segment Analysis
Roadway Segment Location Direction Peak
Hour
Build Out
Year
Traffic
Site
Traffic
Off
Site
Traffic
Total
Traffic
McMillan W. of Goddard
Creek
EB AM 521 7 0 528
WB PM 764 20 0 784
Goddard Creek Way N. of McMillan NB PM 205 30 0 235
SB AM 196 24 0 220
McMillan Road functions as a primary arterial road and should be limited to LOS E with
a maximum of 880 vehicles per hour in the peak direction. When the road is fully
widened to three lanes, it should operate below the LOS E threshold.
Goddard Creek functions as a collector road and should be limited to LOS D with a
maximum of 425 vehicles per hour in the peak direction. At build out, Goddard Creek
will operate will below the maximum recommended volume.
Site Access
The developer is proposing accesses via Goddard Creek Way for the apartments, and to
McMillan Road for the self storage facility. The development has a cross access
agreement to use the private road. All approaches will be public approach and will
exceed the recommended spacing requirements in the ACHD Development Policy
Manual.
There is no proposed direct access on to Goddard Creek Way by individual lots.
DISCUSSIONS
Approved Land Use
The site has been approved for commercial land uses under a previously approved
development application. Typically, such a land use would be for office uses, but could
include coffee shops, hair salons or other retail uses. A site plan for any of these uses has
not been developed at this time, however the intensity of the land use can be estimated
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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using a Floor Area Ratio (FAR) of 22%. This means that only 22% of the total area of
the site could be developed as floor space. The remaining 78% of the area would be
dedicated for parking and access, landscaping, storm drainage, and setbacks. For a 12
acre site, a 22% FAR would allow 115,000 SF of office space. Traffic from such a
development can be estimated using the same trip generation techniques as done for the
proposed site. Trip generation for an office development is shown in Table 12.
Figure 12 - Trip Generatation of Office Development
Roadway Improvements
Required Due to Existing Traffic Conditions
The intersection of Goddard Creek Way and McMillan Road functions at an acceptable
level of service under existing traffic conditions. No improvements are required.
The intersection of Goddard Creek Way and Apgar Creek Lane functions at an
acceptable level of service under existing conditions. No improvements are required.
Goddard Creek Way is operating below capacity under existing conditions.
Required Due to Background Traffic Conditions
The intersection of Goddard Creek Way and McMillan Road is anticipated to function at
an acceptable level of service under background traffic conditions. No improvements are
required.
The intersection of Goddard Creek Way and Apgar Creek Lane is anticipated to function
at an acceptable level of service under background conditions. No improvements are
required.
Goddard Creek Way is anticipated to operate below capacity under background traffic
conditions.
Required Due to Total Traffic Conditions
The intersection of Goddard Creek Way and McMillan Road is anticipated to function at
an acceptable level of service under total traffic conditions. No improvements are
required.
Average Weekday Driveway Volumes
Rate Total Rate Num Rate Num
715 General Office 115 TSF 11.65 1340 0%0 0%0
Average Weekday AM Peak Hour Driveway Volumes
Enter Exit
Rate Total Rate Num Rate Num Total Rate Total Rate Num Rate Num Total Total
715 General Office 115 TSF 1.60 184 0%0 0%0 184 0.20 23 0%0 0%0 23 207
Average Weekday PM Peak Hour Driveway Volumes
Enter Exit
Rate Total Rate Num Rate Num Total Rate Total Rate Num Rate Num Total Total
715 General Office 115 TSF 0.26 30 0%0 0%0 30 1.48 170 0%0 0%0 170 200
Capture Total
1340
ITE
Code Land Use No.Units Enter
Pass ByITE
Code Land Use No.Units 24 hr 2-Way
Capture
Exit Pass By Capture
ITE
Code Land Use No.Units Enter Pass ByPass By Capture
Pass By Capture
Exit
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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The intersection of Goddard Creek Way and Apgar Creek Lane is anticipated to function
at an acceptable level of service under total conditions. No improvements are required.
Goddard Creek Way is anticipated to operate below capacity under total traffic
conditions.
Combined Entrance
If it is decided to provide access for both land uses through a single entrance on
McMillan Road, it will operate at an acceptable level of service under total traffic
conditions.
CONCLUSIONS
This study identifies transportation impacts associated with the proposed Goddard Creek
subdivision in Meridian, Idaho. The project is a high density residential and self storage
facility development. Below are the findings of this report:
This project is a proposed residential development of 74 four plexes and 6.01 acres
of self storage. The residential portion of the development will access Goddard
Creek Way via Apgar Creek Lane. The self storage facility will access McMillan
Road directly.
Based on the trip generation methods recommended in the Trip Generation Manual,
the site will generate 705 trips per day, of which 54 trips will occur during the AM
peak hour and 68 trips will occur during the PM peak hour. The four plexes will
generate 492 of the daily trips, 38 of the AM peak hour trips, and 46 of the PM peak
hour trips.
If the site is developed as office space, the site is estimated to generate 1340 daily
trips, 207 AM peak hour trips, and 200 PM peak hour trips.
The project will impact the intersections of McMillan Road and Goddard Creek
Way, and Goddard Creek Way and Apgar Creek Lane.
The intersection of McMillan Road and Goddard Creek Way is anticipated to
operate at LOS C under total traffic conditions in the build out year. The critical
peak hour is in the PM peak hour.
The intersection of Goddard Creek Way and Apgar Creek Lane is anticipated to
operate at LOS B under total traffic conditions in the build out year. The critical
peak hour is in the PM peak hour.
Goddard Creek Way is anticipated to operate below the maximum recommended
volume for LOS D under total traffic conditions.
Traffic Impact Study
Goddard Creek Subdivision, Meridian, Idaho
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APPENDIX
Traffic Counts
Accident Data
AM HCS Calculations
PM HCS Calculation