PZ - Traffic AnalysisENGINEERING, INC.
181 East 50th Street
Garden City, ID 83714
(208) 841-4996
MEMORANDUM
DATE: February 25, 2019
TO: Laren M. Bailey, MCRP, PMP
DevCO, LLC
FROM: Chhang Ream, P.E., PTOE
CR Engineering, Inc.
PROJECT: Delano Subdivision
Meridian, Idaho
SUBJECT: Trip Generation Update
INTRODUCTION
Thompson Engineers, Inc. completed an abbreviated traffic analysis for the project containing 87 single-
family lots and 36 multi -family dwelling units, and summarized the findings in a letter report dated April
26, 2018. The site plan is revised to contain 85 single-family lots and 78 multi -family dwelling units. As
requested, we updated the traffic analysis with the currently site plan and available traffic data to determine
the anticipated traffic impacts on the adjacent streets. This memo summarizes the findings.
This traffic analysis is not intended to be a traffic impact study and was not prepared to meet ACHD's
requirements for a traffic impact study. ACHD or other agencies may require an additional study for the
project upon review of this traffic analysis.
PROPOSED DEVELOPMENT
Figure 1 shows the site location and vicinity. Delano Subdivision is a proposed residential development
located on Jasmine Lane west of Eagle Road in Meridian, Idaho. The development is estimated to contain
87 single-family lots and 78 multi -family dwelling units. Figure 2 shows the preliminary site plan.
Delano Subdivision is planning to connect to Dashwood Place and Centrepoint Way for site access. Upon
build -out of the development, Jasmine Lane will be disconnected at Centre Point Way and no longer
connect to Eagle Road.
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Figure 1 — Site Location and Vicinity
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Figure 2 — Preliminary Site Plan
Wainwright Dr
ENG � G, INC.
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ENGINEERING, INC.
1.
EXISTING CONDITIONS
The adjacent roadway providing the site are described below:
•
Wainwriaht Drive — A collector street with a posted speed limit of 20 mph. Wainwright Drive
has one lane in each direction with curb, gutter, and sidewalk on both sides of the roadway.
• Dashwood Place — A local street serving eight (8) existing residential dwelling units. Dashwood
Place has one lane in each direction with curb, gutter, and sidewalks on both sides of the
roadway.
• Centrepoint Way — A collector street with a posted speed limit of 20 mph. Centrepoint Drive has
one lane in each direction with curb, gutter, and sidewalks on both sides of the roadway.
The most current traffic counts were obtained for these study area roadways from ACHD's website and
previous studies in the area. Table 1 summarizes the existing traffic counts available on these roadways.
Traffic counts data is attached.
Table 1— Existing Traffic Counts
u y rea
24 -Hour
Peals
oadwa Se ment7
Count Date
Count
Direction
AM Peak
PM Peak
rainwrigh
1,116
EB
76
147
Di —west of Eagle Rd
02/28/2018
(03/12/2015)
WB
85
121
Dashwood PI — south of Wainwright Dr'
Not available
76
NB
4
3
SB
2
5
NB
21 21
68
68
Centrepoint Wy — north of Ustick Rd
3/22-23/2017
1,961
SB
1 Dashwood Place provides access for 8 lots, 24-hour and peak hour traffic volumes were estimated based on ITE
trip generation rates.
TRAFFIC ANALYSIS
Site trip generation is estimated using the procedures recommended in the latest edition of the Trip
Generation Manual (101 edition), published by the Institute of Transportation Engineers. The site trip
generation is obtained by applying the trip generation rates obtained from the manual for the proposed land
uses within the development. Table 2 summarizes the site trip generation. Delano Subdivision is expected
to generate 1,226 trips per weekday, 92 trips during the AM peals hour, and 120 trips during the PM peak
hour at full build -out.
Based on the existing traffic patterns, site access, and general location of the site within the areas, we
anticipated approximately 30% of the trips will have origins/destinations north of the site and 70% south
of the site.
The Centrepoint Subdivision located south of the site will add traffic to the adjacent roadways. Based on
its traffic impact study, this off-site development is expected to generated 1,510 trips per day, 119 trips
during the AM peak hour, and 138 trips during the PM peak hour. Off-site traffic generated by Centrepoint
Subdivision is distributed and assigned to the transportation system with 30% having origins/destinations
north of the site and 70% south of the site.
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Table 2 — Site Trip Generation Summary
Land Use
ITE
Code
Size Unit
Trip
Rate per
Unit
Total
Trips
Entering
Exiting
425 vph
124
175
Weekday Daily (vpd)
Centrepoint Wy — north of Ustick Rd
425 vph
157
204
Single -Family Housing
210
85 DU
9.44
802
50%
401
50%
401
Multi -Family Housing
221
78 DU
5.44
424
50%
212
50%
212
Weekday
Daily Total Trips
1,226
613
613
Weekday AM Peak Hour
(vph)
Single -Family Housing
210
85 DU
0.74
63
25%
16
75%
47
Multi -Family Housing
221
78 DU
0.36
29
26%
8
74%
21
Weekdy AM Peak HourTotal Trips
92
24
68
Weekday PM Peak Hour
(vph)
Single -Family Housing
210
85 DU
0.99
85
66%
56
34%
29
Multi -Family Housing
221
78 DU
0.44
35
61%
21
39%
14
Weekday PM Peak HourTotal Trips
120
77
43
The study area roadway segments were evaluated based on the level of service (LOS) planning thresholds
in accordance with Table 2 in ACHD Policy Manual, Section 7106. The roadway segment LOS is based on
the maximum peak hour directional volume for different roadway functional classifications, number of
through lanes, and left -turn type. The minimum acceptable level of service planning threshold for collector
streets is LOS D. Table 2 in ACHD Policy Manual does not include LOS planning thresholds for local
streets. According to Section 7207 of ACHD policy, the allowable ADT on local streets is typically 1,000
vpd and under 2,000 vpd when stub streets are connected and adjacent developments are fully developed.
Table 3 summarizes the estimated total traffic on the adjacent roadways, which include existing traffic, off-
site traffic generated by Centrepoint Subdivision, and site traffic. All study area roadway segments are
expected to meet ACHD LOS planning thresholds under total traffic conditions.
Table 3 — Study Area Roadway Segment LOS — Existing Plus Off -Site Plus Site Traffic
Study Area
Roadway S t
ACHD LOS
Planning
Threshold
Peak Hour
Directional Volume [vphl
Meets LOS
Planning
Threshold?
AM Peak
PM Peak
Wainwright Dr — west of Eagle Rd
425 vph
124
175
Yes
Centrepoint Wy — north of Ustick Rd
425 vph
157
204
Yes
Dashwood PI — south of Wainwright Dr
1,000-2000 vpd
897 vpd
Yes
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�{ ENG�RWG INC.
CONCLUSIONS
Based on the traffic analysis, it is our opinion that traffic generated by the Delano Subdivision is not
expected to have a significant impact on the adjacent roadways. The existing collector and local streets
adjacent to the site are expected to meet ACHD LOS planning thresholds.
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