PZ - Traffic Impact StudyTraffic Impact Study Update
Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
Table of Contents
EXECUTIVESUMMARY..........................................................................................................................1
Introduction..............................................................................................................................................1
ProposedDevelopment.............................................................................................................................
I
StudyArea................................................................................................................................................1
Conclusions..............................................................................................................................................1
INTRODUCTION........................................................................................................................................
3
PROPOSED DEVELOPMENT....................................................................................................................4
STUDYAREA CONDITIONS....................................................................................................................
5
StudyArea................................................................................................................................................
5
LandUse...................................................................................................................................................
5
STUDYPERIOD..........................................................................................................................................
5
BuildOut Year..........................................................................................................................................
5
StudyHours..............................................................................................................................................
5
EXISTINGCONDITIONS...........................................................................................................................5
RoadSystem.............................................................................................................................................
5
TrafficVolumes........................................................................................................................................
5
DailyTraffic.............................................................................................................................................
7
SystemImprovements..............................................................................................................................
8
AccidentAnalysis.....................................................................................................................................
8
PROJECTEDTRAFFIC...............................................................................................................................
8
BackgroundTraffic...................................................................................................................................
8
OffSite Traffic.........................................................................................................................................
8
TripGeneration.......................................................................................................................................11
TripDistribution.....................................................................................................................................11
SiteTraffic..............................................................................................................................................12
TotalTraffic............................................................................................................................................12
TRAFFICANALYSIS...............................................................................................................................17
Capacity Analysis and Level of Service.................................................................................................17
IntersectionAnalysis..............................................................................................................................18
RoadwayAnalysis..................................................................................................................................19
SiteAccess..............................................................................................................................................19
SiteCirculation.......................................................................................................................................19
TurnLanes..............................................................................................................................................20
SignalWarrant Analysis.........................................................................................................................21
DISCUSSIONS...........................................................................................................................................
21
RoadwayImprovements.........................................................................................................................
21
Required Due to Existing Traffic Conditions.....................................................................................21
Required Due to Background Traffic Conditions..............................................................................
22
Required Due to Total Traffic Conditions.........................................................................................22
CutThrough Traffic................................................................................................................................23
CONCLUSIONS.........................................................................................................................................
23
ThompsonEngineers
Traffic and Civil Inc.
List of Figures
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Figure1 - Project Location...........................................................................................................................3
Figure2 - Preliminary Site Plan....................................................................................................................4
Figure 3 - Existing AM Peak Hour Conditions............................................................................................. 6
Figure 4 - Existing PM Peak Hour Conditions............................................................................................. 7
Figure 5 - Build Out Year AM Peak Hour Background Traffic................................................................... 9
Figure 6 - Build Out Year PM Peak Hour Background Traffic..................................................................10
Figure7 - Trip Distribution.........................................................................................................................12
Figure 8 - AM Peak Hour Site Traffic........................................................................................................13
Figure 9 - PM Peak Hour Site Traffic.........................................................................................................14
Figure 10 - Build Out Year Total AM Peak Hour Traffic..........................................................................15
Figure 11 - Build Out Year Total PM Peak Hour Traffic...........................................................................16
Figure 12 - Internal Daily Traffic Volumes................................................................................................20
Figure 13 - Right Turn Lane Guidelines for Two Lane Road.....................................................................21
List of Tables
Table1 — Existing Daily Traffic................................................................................................................... 8
Table2 - Trip Generation...........................................................................................................................11
Table 3 - AM Peak Hour Intersection Analysis Summary.........................................................................17
Table 4 - PM Peak Hour Intersection Analysis Summary..........................................................................18
Table 5 - Roadway Segment Analysis........................................................................................................19
Table6 - Right Turn Lane Data..................................................................................................................20
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Traffic Impact Study Update
Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
EXECUTIVE SUMMARY
Introduction
Thompson Engineers, Inc. has been retained to update a traffic impact study for the
proposed Caven Ridge Subdivision in Meridian, Idaho. The project is located near
Victory Road and Meridian Road. The purpose of this study is to evaluate the potential
traffic impacts resulting from the changes in the project and make recommendations for
mitigation of those impacts. The study is prepared in accordance with the requirements
of the Ada County Highway District.
Proposed Development
The project is a residential development of approximately 157 single family dwelling
units. Phase 1 consists of 91 units and was approved by the City of Meridian in July of
2017. Phase 2 was not included in the approval, but was included in the original traffic
impact study. For this report, Phase 2 has increased from 47 single family dwellings to
66 single family dwellings.
The site is expected to access the transportation system primarily via Standing Timber
Way. It will also connect to existing stub roads to provide inter connectivity to
neighboring subdivisions.
The site is located 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 Victory Road. The study area will include
the intersections of:
■ Standing Timber Way and Victory Road
■ Victory Road and Meridian Road
■ Rumpel Lane and Meridian Road
Conclusions
Below are the findings of this report:
■ Based on the trip generation methods recommended in the Trip Generation Manual,
the site will generate 1,495 1,341 trips per day, of which 118 103 trips will occur
during the AM peak hour and 157 139 trips will occur during the PM peak hour.
This is an increase from 1,341 trips per day in the original study, with 118 trips
occurring in the AM peak hour and 159 occurring in the PM peak hour.
■ The intersection of Meridian Road and Victory Road will operate at LOS C under
total traffic conditions in the build out year. The critical peak hour is in the PM peak
hour. The west and east bound approaches will operate at LOS D. This has not
changed from the original report.
ThompsonEngineers Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Trac and Civil Inc.
■ The intersection of Victory Road and Standing Timber Way will operate at LOS C
under total traffic conditions in the build out year. The critical peak hour is in the
PM peak hour. This has not changed from the original report.
■ The intersection of Meridian Road and Rumpel Lane (Harris St.) currently operates
at LOS F under existing traffic conditions. The critical peak hour is in the PM peak
hour. The poor LOS is due to the eastbound left turn movement from Harris St. on
to Meridian Road, and the very large volume of traffic on Meridian Road.
Additional lanes on Harris St. will not improve the operation of the intersection.
This intersection will not warrant a traffic signal. Caven Ridge West will not add
traffic to this movement.
■ Victory Road is operating below the maximum recommended volume for LOS E
under total traffic conditions.
■ Standing Timber Way is operating below the maximum recommended volume for
LOS D under total traffic conditions.
■ The increase in lots will have the most direct access to Standing Timber Way and
Victory Road. Traffic from this development will not be inclined to cut through
subdivisions to the east.
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ThompsonEngineers
Traffic and Civil Inc.
INTRODUCTION
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Thompson Engineers, Inc. has been retained to update the traffic impact study for the
proposed Caven Ridge Subdivision in Meridian, Idaho. The project is located near
Victory Road and Meridian 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:
IIII 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
Figure 1- Project Location
�L�
� l l
Bear N HL ro
Creek,;,
Park �' �� �\ 'P,. E Beagle St
s0
Bear Creek `� Meridian
Park
W Cub 51 ,�\✓�.�
r
�Jlrs
i75 ss \ rr
1 Victory Rd E Victory Rd
L Project LocationX, 1?1Q11
a
E Ionia
"�� Ionia'
"\
-----fI E Sicily St iJ
�E Palermo Dr
E Mona Lisa
O r
E Pisa St
W Harris St E Rumpel Ln
a�
S. Ipr•ojects117-40 Caven UpdateldocslCaven TIS Update.docx Page 3
ThompsonEngineers Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
PROPOSED DEVELOPMENT
The project is a residential development of approximately 157 single family dwelling
units. Phase 1, consisting of 72 units, was approved by the City of Meridian in July of
2017. Phase 2 was not included in the approval, but was included in the original traffic
impact study. For this report, Phase 2 has increased from 47 units to 66 units. A
preliminary site plan is shown in Figure 2. The site is expected to access the
transportation system via Standing Timber Way to Victory Road.
2 - Preliminary Site Plan
Ft
Sub(
I,
i
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STUDY AREA CONDITIONS
Study Area
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
The area of influence is anticipated to be Ada County, Idaho, including the City of
Meridian. The primary impacts will be along Standing Timber Way and Victory Road.
The study area will include the intersection of Standing Timber Way and Victory Road,
and Victory Road and Meridian as determined by a model run of the COMPASS
transportation model. The intersection of Rumpel Lane and Meridian Road is also
included as a future access.
Land Use
The site is within the Meridian City limit and is currently vacant. Existing zoning is for
residential use.
STUDY PERIOD
Build Out Year
The Build out Year for this project is assumed to be 2020 to correspond with COMPASS
data, other developments, and the previous study. Actual build out of the site will depend
on market conditions and project implementation.
Study Hours
The AM peak hour, between 7:00 AM and 9:00 AM, and the PM peak hour, between
4:00 PM and 6:00 PM, were the study hours of this report.
EXISTING CONDITIONS
Road System
Victory Road is classified as a minor arterial road by ACHD. In the vicinity of this
project, it has one through lane in each direction, a center left turn lane, bike lanes, and
curb gutter and sidewalk. Lanes are approximately 12 feet wide. There is a posted speed
of 45 MPH in front of the project.
Standing Timber 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.
Rumpel Lane is undeveloped but is a proposed collector road.
Traffic Volumes
AM and PM Traffic counts were obtained at the intersections in the study area the week
of January 26, 2017. Existing AM Peak Hour traffic volumes are shown in Figure 3.
Existing PM Peak Hour traffic volumes are shown in Figure 4.
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Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil IncTraffic Impact Study Update
.
Figure 3 - Existing AM Peak Hour Conditions
15
0
3
1
6*
1539 1
a2
0
(� 0
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2 21
5
a286
4
1 26
0 0
J 4
0
a0
4�30
0 0
Page 6
Traffic Impact Study Update
Thompson I Engineers Caven Ridge Subdivision, Meridian, Idaho
Tra; ► ► k and c
iv► nc.
Figure 4 - Existing PM Peak Hour Conditions
143 20
�r � a
19 � 1�29
268 E:> a575
12 14
4 1 8
0 0 0
0 C 44 0
a � �a
0 0 0
1.1%sv
111 1591 7
V
s �a
1 � �a
1 763 0
Daily Traffic
Daily counts on the study reoadway segments were obtained by L2 Data Collection on
January 26, 2017 are summarized in Table 1.
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Page 7
ThompsonEngineers
Traffic and Civil Inc.
Table I — Existing Daily Traffic
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Roadway Segment
Location
Daily
Volume
Direction
Peak
Hour
Count
Date
Victory Road
E. of Meridian
7399
EB
AM
399
1/26/17
WB PM 599
1/26/17
Standing Timber Way
S. of Victory
490
NB
AM
42
1/26/17
SB PM 29
1/26/17
System Improvements
In the ACHD 20 year plan, Victory Road is proposed for construction to three lanes, bike
lanes, curb, gutter, and sidewalk both east of this project and west of Meridian Road. It is
planned for the 2026-2030 planning period. It is currently unfunded. This project does
not impact Victory Road in front of this project. Victory Road in front of the project was
recently constructed to 3 lanes by ACHD.
Accident Analysis
Accident data for the intersection of Victory Road and Standing Timber Way for the
years 2011 through 2015 was obtained from the LHATC. The full report is included in
the appendix of this report. The report found that there was one intersection related
accident at this intersection. The contributing factor was improper turning. A single
accident at this intersection in a five year period does not constitute any safety issues.
Accident data for the intersection of Meridian Road and Rumpel for the years 2011
through 2015 was obtained from the LHATC. The full report is included in the appendix
of this report. The report found that there was one intersection related accident at this
intersection. The contributing factor was improper turning. A single accident at this
intersection in a five year period does not constitute any safety issues.
Accident data for the intersection of Victory Road and Meridian Road for the years 2011
through 2015 was obtained from the LHATC. The full report is included in the appendix
of this report. There were six accidents in the vicinity, but only two were intersection
related. Meridian Road has about 27,000 vehicles per day and Victory Road has 7400.
This volume of accidents does not constitute a possible safety issue.
PROJECTED TRAFFIC
Background Traffic
Future traffic is obtained by expanding the existing traffic volumes by a growth factor.
A growth factor of 2.6% per year is used to match to original report. 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
Other portions of this project are under construction at this time. Traffic from these
developments is added to the expanded traffic. Other developments are included in the
growth factor.
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Traffic Impact Study Update
Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
Figure S - Build Out Year" Peak Hour Background Traffic
N27' 2 23
85
91 309
13�� 6
31 1 34
0 2 5
0a
0
0 6 0
•1" I
~� 2 615 2
16 2
3 0
1 1662 1
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Traffic Impact Study Update
Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
Figure 6- Build Out Year PM Peak Hour Background Traffic
3 22
31
�RG21
35
1 15
F—f2- 1718
�
el I n
8
a
62
1
�o
1 sea
o
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ThompsonEngineers
Traffic and Civil Inc.
Trip Generation
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
In the absence of site-specific data, 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. 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 2 shows the trip generation of the site.
Table 2 - Trip Generation
Summary of Trip Generation
Average Weekday Driveway Volumes
ITE
24 hr 2 -Way
Enter
Exit
Land Use
No.
Units
Total
Rate
I Total
Code
Rate
Rate
210
Single Family
157
DU
9.52
1495
1495
Total
Dwellin s
210
Single Family
157
DU
0.75
Total
I
1
1 1,4951
1,495
Average Weekday AM Peak Hour Driveway Volumes
ITE
Enter
Enter
Exit
Exit
Land Use
No.
UnitsK1930
Rate
Rate
Total
Code
Code
Total
Total
Total
210
Single Family
157
DU
0.75
118
30
0.56
88
88
118
Dwellings
Total
1 11
30
30
88
88
118
Average Weekday PM Peak Hour Driveway Volumes
ITE
Enter
Enter
Exit
Exit
Land Use
No.
Units
Rate
Total
Rate
Total
Code
Total
Total
Total
210
Single Family
157
DU
0.75
118
118
0.25
39
39
157
Dwellin s
Total
1 11
118
1 118 11
39
1 39
1 157
This is an increase from the original study estimate of 1,314 trips per day, with 103 in the
AM peak hour and 139 in the PM peak hour.
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. Site
traffic distribution for the development is shown in Figure 7.
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Trac and Civil Inc.
Figure 7- Trip Distribution
3
Site Traffic
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Ilk
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. All of the new trips are assigned to Caven Ridge West roadways.
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 for the
build out year of 2020.
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Traffic Impact Study Update
ThompsonEngineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil inc.
Figure 8 -AM Peak Hour Site Traffic
0
0
0
0
T�
12
�0
�0
2
0 0 0
. <:D 4
09.� o ao
1a � (?> �?1s
30 1 50
9 13 6
4221
a o
1 �0
2 1s o
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Thompson Engineers
Traffic and Civil Inc.
Figure 9 - PM Peak Hour Site Traffic
0 0 3 Pi 9 0
a6 �s s 10�a
0 �10 0=>ao
(' C � � �a
0 0 2
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
0
�0
0
12
30 41 32
1a 6 �a
2 �� 6��2
2 11 0
S:Iprojectsl]7-40 Caven UpdateWocslCaven TIS Update. docx Page 14
ThompsonEngineers Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
Figure 10 -Build Out Year Total AM Peak Hour Traffic
5
309
24
21
0
0
—� et t I
' _ 2 615 4 12 0
16 94 4 0
%0
0
3�
1
1662
a 0
0
3
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Thompson I EngineersTraffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
, ratuc and C►v►t Inc.
Figure 11- Build Out Year Total PM Peak Hour Traffic
� Victory irl 1
57 1490 232
r
U 31
621
98
\.=9
0
6:32
— — --- k"41n— 9 0
6 ��12 1718 17 5� �0
13 8 �J 4
0 L� 0
1 n �0
1 824 2
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ThompsonEngineers
Traffic and Civil Inc.
TRAFFIC ANALYSIS
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
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 3 shows the AM peak hour intersection. Table 4 shows the PM peak
intersection. Copies of the calculations are included in the appendix of this report.
Table 3 - AM Peak Hour Intersection Analysis Sutnnrary
LOS Summary
2017
Build
Out
Existing
Background
Total
DelayDelay
Delay
I
AM Peak Hour Conditions
s/v
v/c
LOS
s/v
v/c
LOS
s/v
We
LOS
Standing Timber/Victory
12.7
B
13.5
B
14.6
B
NB Approach
14.1
0.04
B
15.3
0.09
C
17.1
0.19
C
SB Approach
12.7
0.10
B
13.5
0.12
B
14.6
0.14
B
EB Approach
7.9
0.01
A
8.0
0.01
A
8.0
0.01
A
WB Approach
8.2
0.01
A
8.3
0.01
A
8.4
0.02
A
Meridian/Rumpel
23.2
C
25.7
D
26.6
D
NB Approach
8.9
0.00
A
9.0
0.00
A
9.0
0.00
A
SB Approach
15.3
0.01
C
16.7
0.01
C
16.7
0.01
C
EB Approach
23.2
0.09
C
25.7
0.11
D
26.6
0.11
D
WB Approach
17.5
0.01
C
18.9
0.01
C
19.7
0.06
C
Standing Timber/Sicily
9.5
A
NB Approach
7.3
0.00
A
SB Approach
7.3
0.00
A
EB Approach
9.5
0.06
A
WB Approach
8.5
0.02
A
Standing Timber/Palermo
8.7
A
NB Approach
7.2
0.00
A
SB Approach
7.2
0.01
A
EB Approach
8.7
0.00
A
WB Approach
8.4
0.02
A
Meridian/Victory
23.0
0.71
C
25.1
0.76
C
26.9
0.79
C
EB Approach
43.9
D
43.0
D
40.8
D
Left
39.2
0.29
D
38.1
0.28
D
36.2
0.26
D
Thru/Right
45.7
0.57
D
44.8
0.58
D
42.5
0.52
D
WB Approach
46.8
D
46.0
D
45.2
D
Left
40.1
0.26
D
39.1
0.27
D
37.1
0.24
D
Through
45.5
0.49
D
44.5
0.48
D
42.4
0.43
D
Right
49.5
0.77
D
48.8
0.78
D
48.9
0.81
D
NB Approach
18.4
B
22.0
C
25.0
C
Left
8.0
0.10
A
8.7
0.12
A
9.7
0.12
A
Through
18.5
0.68
B
22.1
0.76
C
25.0
0.77
C
Right
19.0
0.69
B
23.0
0.77
C
26.1
0.80
C
SB Approach
11.0
B
12.3
B
13.7
B
Left
14.0
0.29
B
18.1
0.37
B
21.0
0.44
C
Through
10.6
0.25
B
11.6
0.28
B
12.8
0.29
B
Right
8.9
0.02
A
9.6
0.02
A
10.5
0.02
A
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ThompsonEngineers Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil inc.
Table 4 - PM Peak Hour Intersection Analysis Summary
LOS Summary
2017
Build
Out
Existing
Background
Total
DelayDelay
Delay
PM Peak Hour Conditions
s/v
v/c
LOS
s/v
v/c
LOS
s/v
v/c
LOS
Standing Timber/Victory
16.9
C
19.3
C
23.5
C
NB Approach
17.5
0.02
C
20.1
0.04
C
27.4
0.17
C
SB Approach
16.9
0.12
C
19.3
0.15
C
23.5
0.19
C
EB Approach
9.0
0.02
A
9.3
0.03
A
9.3
0.03
A
WB Approach
7.9
0.01
A
8.1
0.03
A
8.4
0.09
A
Meridian/Rumpel
50.9
F
61.8
F
62.7
F
NB Approach
15.0
0.00
B
16.3
0.00
C
16.3
0.00
C
SB Approach
9.5
0.01
A
9.8
0.01
A
9.8
0.02
A
EB Approach
50.9
0.09
F
61.8
0.11
F
62.7
0.11
F
WB Approach
11.1
0.01
B
11.5
0.01
B
11.6
0.02
B
Standing Timber/Sicily
9.6
A
NB Approach
7.4
0.00
A
SB Approach
7.3
0.02
A
EB Approach
9.6
0.02
A
WB Approach
8.6
0.01
A
Standing Timber/Palermo
8.9
A
NB Approach
7.2
0.00
A
SB Approach
7.3
0.03
A
EB Approach
8.9
0.01
A
WB Approach
8.6
0.01
A
Meridian/Victory
22.5
0.84
C
24.1
0.88
C
24.7
0.90
C
EB Approach
47.9
D
46.6
D
46.4
D
Left
43.6
0.30
D
42.4
0.32
D
42.2
0.31
D
Thru/Right
49.3
0.58
D
48.0
0.56
D
47.8
0.56
D
WB Approach
48.2
D
48.0
D
48.4
D
Left
50.0
0.71
D
51.3
0.74
D
52.5
0.76
D
Through
58.5
0.78
D
47.6
0.79
D
47.4
0.79
D
Right
45.5
0.59
D
44.5
0.56
D
45.5
0.66
D
NB Approach
14.1
B
16.0
B
17.2
B
Left
13.0
0.14
B
15.6
0.17
B
15.9
0.17
B
Through
14.1
0.39
B
16.0
0.43
B
17.2
0.45
B
Right
14.2
0.39
B
16.1
0.43
B
17.3
0.45
B
SB Approach
14.8
B
17.3
B
17.4
B
Left
9.1
0.40
A
10.5
0.46
B
11.4
0.55
B
Through
15.8
0.66
B
18.5
0.73
B
18.7
0.73
B
Right
8.8
0.06
A
9.5
0.06
A
9.6
0.06
A
Intersection Analysis
The increase in dwelling units will result in a minor increase in delay and volume to
capacity ratio at all intersections in the build out year. The level of service does not
increase at any of the intersections.
The intersection of Standing Timber Way and Victory Road will operate at LOS C in the
PM peak hour under build out traffic conditions.
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Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Traffic Impact Study Update
Inc.
The intersection of Victory Road and Meridian Road will function at LOS C under
background and build out traffic conditions without any modifications to the signal.
The intersection of Rumpel Lane and Meridian Road currently operates at LOS F for the
eastbound left turn movement of Harris Street (opposite of Rumpel Lane). This
movement will continue operate at LOS F under background and total traffic conditions.
The addition of site traffic increases the delay for this movement by 0.1 seconds per
vehicle. This project does not add traffic to this movement.
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 5.
Table S - Roadway Segment Analysis
Roadway Se men
Location
Direction
Peak
Hour
Build Out
Year
Traffic
Site
Traffic
Off
Site
Traffic
Total
Traffic
Victory Road
E. of Meridian
EB
AM
410
10
15
435WB
PM 645 10 20
675
Standing Timber
S. of Victory
NB
AM
20
81
20
121
SB
I PM 30 1 60 20
100
Victory Road is classified as a minor arterial roadway. The minimum level of service
required by ACHD policy is LOS E with a maximum directional hourly volume of 720
vehicles per hour for a three lane section. This segment of Victory Road will operate
better than LOS E in the PM peak hour.
The addition of site traffic and offsite traffic will reverse the peak flow direction on
Standing Timber Way. Standing Timber Way functions as a collector and should be
limited to LOS D with a maximum of 425 vehicles per hour in the peak direction. This
road should operate below the LOS D threshold.
Site Access
The developer is proposing three accesses on Standing Timber Way. 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 Standing Timber Way by individual lots.
Site Circulation
The increase in number of units in Caven Ridge West will result in a volume of less than
1,000 vpd on all internal roads of this phase of the project, shown in Figure 12.
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Traffic Impact Study Update
Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
Figure 12 - Internal Daily Traffic Volumes
Turn Lanes
Right turn lanes are analyzed using the guidelines in the ACHD Development Policy
Manual.
Table 6 - Right Turn Lane Data
Roadway
Intersection
Through
Traffic
Right
Turns
Critical
Movement
Victory Road
Standing Timber
AM Peak
391
23
PM Peak
289
63
X
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Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Traffic Impact Study Update
Inc.
Figure 13 - Right Turn Lane Guidelines for Two Lane Road
40
20
0-
200
300 4C0 5Co 800 700 800 Poo loco 1100 12C
Major -Road Volume (one direction). vehlh
A right turn lane is not warranted at the eastbound right turn movement on Victory Road
at Standing Timber Way. The proposed right in and right out approaches do not warrant
right turn lanes.
Victory Road has a two way center left turn lane, so analysis of a left turn lane is not
required.
Signal Warrant Analysis
The intersection of Standing Timber Way and Victory Road operates at LOS D or better,
so a signal warrant analysis is not required.
The intersection of Meridian Road and Rumpel Lane has a peak hour volume of 11
vehicles per hour. It will not warrant a signal.
DISCUSSIONS
Roadway Improvements
Required Due to Existing Traffic Conditions
The intersection of Standing Timber Way and Victory Road functions at an acceptable
level of service under existing traffic conditions. No improvements are required.
The intersection of Meridian Road and Victory Road functions at an acceptable level of
service under existing traffic conditions. No improvements are required.
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ajor-Roadspeed
40 mph I60
kmth)
45 mph
(7o km/h
Add
Right-Tur
Lane
50 m
(80 kn
.h
Victory
Entrance
55 mp
(50 knV
)
=> 80
(10D
mph
mh)
0-
200
300 4C0 5Co 800 700 800 Poo loco 1100 12C
Major -Road Volume (one direction). vehlh
A right turn lane is not warranted at the eastbound right turn movement on Victory Road
at Standing Timber Way. The proposed right in and right out approaches do not warrant
right turn lanes.
Victory Road has a two way center left turn lane, so analysis of a left turn lane is not
required.
Signal Warrant Analysis
The intersection of Standing Timber Way and Victory Road operates at LOS D or better,
so a signal warrant analysis is not required.
The intersection of Meridian Road and Rumpel Lane has a peak hour volume of 11
vehicles per hour. It will not warrant a signal.
DISCUSSIONS
Roadway Improvements
Required Due to Existing Traffic Conditions
The intersection of Standing Timber Way and Victory Road functions at an acceptable
level of service under existing traffic conditions. No improvements are required.
The intersection of Meridian Road and Victory Road functions at an acceptable level of
service under existing traffic conditions. No improvements are required.
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ThompsonEngineers
Traffic and Civil Inc.
Traffic Impact Study Update
Caven Ridge Subdivision, Meridian, Idaho
The intersection of Meridian Road and Rumpel Lane (Harris Street) will function at LOS
F due to the eastbound left turn movement on Harris Street. Additional lanes on Harris
Street will not improve the level of service of this movement. This intersection will not
warrant a traffic signal due to the very low volumes of traffic on the side streets.
The segment of Victory Road east of Meridian Road is operating below capacity under
existing conditions.
Standing Timber Way is operating below capacity under existing conditions.
Required Due to Background Traffic Conditions
The intersection of Standing Timber Way and Victory Road is anticipated to function at
an acceptable level of service under background traffic conditions. No improvements are
required.
The intersection of Meridian Road and Victory Road is anticipated to function at an
acceptable level of service under background traffic conditions. No improvements are
required.
The segment of Victory Road east of Meridian Road is anticipated to operate below
capacity under background traffic conditions.
Standing Timber Way is anticipated to operate below capacity background traffic
conditions.
Required Due to Total Traffic Conditions
The intersection of Standing Timber Way and Victory Road is anticipated to function at
an acceptable level of service under background traffic conditions. No improvements are
required.
The intersection of Meridian Road and Victory Road is anticipated to function at an
acceptable level of service under background traffic conditions. No improvements are
required.
The intersection of Meridian Road and Rumpel Lane (Harris Street) will continue to
function at LOS F due to the eastbound left turn movement on Harris Street. This
intersection will not warrant a traffic signal due to the very low volumes of traffic on the
side streets with the current developments under study. The land south of Harris Street is
undeveloped at this time. As this area develops, it may eventually warrant a signal.
The segment of Victory Road east of Meridian Road is anticipated to operate below
capacity under background traffic conditions.
Standing Timber Way is anticipated to operate below capacity background traffic
conditions.
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Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil IncTraffic Impact Study Update
.
Cut Through Traffic
The increase in number of dwelling units will occur in the development closest to the
intersection of Standing Timber Way and Victory Road, which will be the fastest route to
the roadway system. It is unlikely that any trips from this development will choose to use
local streets to the east as a means of accessing the transportation system
The increase in delay at the intersection of Standing Timber Way and Victory Road is
minor and will not change the conclusions of the original report concerning cut through
traffic. If anything, traffic from the subdivision to the east will be more likely to use
Standing Timber Way than vice versa.
CONCLUSIONS
This study identifies transportation impacts associated with the proposed Caven Ridge
subdivision in Meridian, Idaho. The project is a single family dwelling unit development.
Below are the findings of this report:
■ Based on the trip generation methods recommended in the Trip Generation Manual,
the site will generate 1,495 trips per day, of which 118 trips will occur during the
AM peak hour and 157 trips will occur during the PM peak hour. This is an increase
from 1,341 trips per day in the original study, with 103 trips occurring in the AM
peak hour and 139 occurring in the PM peak hour.
I The intersection of Meridian Road and Victory Road will operate at LOS C under
total traffic conditions in the build out year. The critical peak hour is in the PM peak
hour. The west and east bound approaches will operate at LOS D. This has not
changed from the original report.
N The intersection of Victory Road and Standing Timber Way will operate at LOS C
under total traffic conditions in the build out year. The critical peak hour is in the
PM peak hour. This has not changed from the original report.
■ The intersection of Meridian Road and Rumpel Lane (Harris Street) currently
operates at LOS F under existing traffic conditions. The critical peak hour is in the
PM peak hour. The poor LOS is due to the eastbound left turn movement from
Harris Street on to Meridian Road, and the very large volume of traffic on Meridian
Road. Additional lanes on Harris Street will not improve the operation of the
intersection. This intersection will not warrant a traffic signal. Caven Ridge West
will not add traffic to this movement. The intersection may eventually warrant a
signal as parcels south of Harris Street develops.
■ Victory Road is operating below the maximum recommended volume for LOS E
under total traffic conditions.
■ Standing Timber Way is operating below the maximum recommended volume for
LOS D under total traffic conditions.
■ The increase in lots will have the most direct access to Standing Timber Way and
Victory Road. Traffic from this development will not be inclined to cut through
subdivisions to the east.
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Traffic Impact Study Update
Thompson Engineers Caven Ridge Subdivision, Meridian, Idaho
Traffic and Civil Inc.
APPENDIX
Revised AM HCS Calculations
Revised PM HCS Calculation
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