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DOBIE ENGINEERING. INC.
TRAFFIC STUD Y
FOR
CROSSROADS SUBDIVISION
AND RETAIL. CENTER
Y~ >,
SUBMITTED TO:
ADA COUNTY HIGHWAY pISTR1CT
318 E. 57TH, ST.
601SE, f0 83714
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Evaluated in this report are the traffic impacts associated with the
,d ~+:# s~~~se, r:~v~rtt~erc'~resdental deu,~~nt-at~#t't~
,~.
,~~~~µ~ a~d.~~gie Road.~"The findings of the evaluation
are summarized as follows.
1. Crossroads Subdivision is a mixed use development proposing 256 single
family residential lots and eft. of reta~t~Cart~tl~erc~al~nd general
office use.
2. The residential lots will be developed between 1994 and 1997, and the
commercial area will be built out over a 12 year period.
3. The Eagle/Fairview intersection is in the Meridian Planning Area, and the
lands around the intersection are masterplanned for commercial uses. An
additional 150 residential lots and 400,000 square feet of commercial and
industrial park development are assumed to occur on these lands during
the study period.
4. The Meridian area is now experiencing a strong growth rate and the
recently adopted comprehensive plan identifies a 10 percent annual
growth projection for the next decade. This relatively high projected rate
was used in this study to forecast future traffic volumes and distribution.
Prepared by Oobie Engineering, Inc.
• . j
SUMMARY OF FINDINGS
ii
5. Eagle Road is part of the Idaho Transportation Department system, and
Fairview Avenue is in the jurisdiction of ACRD.
.. n
6. The Eagle/Fairview intersection is fully improved with a five lane road
system adjacent to the site. Eagle Road north of Fairview now has 3
lanes and is scheduled for widening in 1997.
7. ACRD is currently planning an extension of Pine Street along the south
boundary of the Crossroads site. The right-of-way for this improvement
will be preserved and internal roads aligned for a future connection to this
proposed collector.
8. A capacity and level of service analysis was prepared for the Eagle
Road/Fairview Avenue intersection, in which it was found that acceptable
capacity would be available to accommodate projected 2005 traffic
volumes including the site-generated traffic for Crossroads.
9. A similar analysis was prepared for the main entrances for the
development, in which both signalized and unsignalized conditions were
assumed:
a. It was determined that a traffic signal would be needed at
the proposed intersection of Eagle Road and Congressional Drive
which is located 1000 ft. south of Fairview and 1650 ft. north of the
Prepared by Dobie Engineering, Inc.
SUMMARY OF FINDINGS
. iii
proposed Pine Street extension. Congressional Drive aligns with
the existing entrance to the Treasure Valley Business Park.
. :.
b. A signal will be needed at the preposed intersection~of
Reagan Drive and Fairview Avenue approximately 2100 ft. east of
Eagle Road.
c. Without these signals severe congestion would result on all
legs of the intersection and would likely cause safety and flow
problems on the arterial roads.
10. The approach roads at Congressional and Reagan Drives should be '~
improved with three exit lanes and a deceleration lane on the arterial.
11. The proposed roadway extension and intersection improvements at Pine
Street and Eagle Road were not evaluated in this study. A separate study
is being prepared by WH Pacific Engineers under contract with the Ada
County Highway District.
Prepared by Dobie Engineering, Inc.
CROSSROADS SUBDIVI~N TRAFFIC STUDY
1
PROPOSED DEVELOPMENT
Study Objectives
!1
The purpose of this study is to asses the traffic impacts resulting from the
development of the Crossroads Subdivision and to evaluate the capacity of the
road system to accommodate the site-generated traffic.
On-Site Development
Crossroads Subdivision is a proposed 154.5 acre mixed use development
comprised of 256 residential lots and 5 commercial lots located at the southeast
corner of Eagle Road and Fairview Avenue.
The residential lots will be developed in three phases with the first group
of 45 lots on line in 1994. Phases 2 and 3 are 100 lots each and will develop in
1995 and 1996 respectively. By 1997 the residential portion of the development
will be complete.
Prepared by Dobie Engineering, Inc.
CROSSROADS SUBDIVISION
TRAFFIC STUDY
FIGURE 1
MCMILLAN RD.
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EMER
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~ PINE ST.
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FRANKLIN R0.
INTERSTATE 84
OVERLAND RD.
Traffic Study Prepared By:
DOBIE ENGINEERING, INC.
VICINITY MAP
777 Hearthstone Or. Boise, i0 83702 345-3290
•
CROSSROADS SUBDIVISION TRAFFIC STUDY
13
Table 6
Peak Hour Trip Distribution
(% of PH Trips)
Trios Out
Right Left
Eagle Entrance
Residential:
AM Peak Hour 28% 45%
PM Peak Hour 15% 22%
Commercial:
AM Peak Hour 17% 25%
PM Peak Hour 35% 15%
Fairview Entrance:
Residential:
AM Peak Hour 35% 58%
PM Peak Hour 20% 33%
Commercial:
AM Peak Hour 28% 10%
PM Peak Hour 20% 30%
r
Trips In
Right Left
17% 10%
40% 23%
23% 35%
35% 15%
33% 20%
35% 58%
40% 24%
20% 30%
Prepared by Dobie Engineering, Inc.
-- _ •
Traffic Assignments
LJ
CROSSROADS SUBDIVISION TRAFFIC STUDY
14
Based on the trip generation and distribution assumptions previously
presented, future trips resulting from development of the Crossroads Subdivision
lots and retail center were estimated and assigned to the internal streets and
project entrances. The projected average daily traffic volumes are illustrated in
Figure 4.
Projected PM turning movements for the calendar year 2005 at the project
entrances are illustrated in Figures 5 and 6. These volumes include the future
traffic from the full buildout of the Crossroads Retail Center plus the background
traffic growth resulting from the development of the surrounding communities.
In addition to these turning movements, new traffic will accrue from the
development of the lands north and west of Crossroads. This traffic was
similarly estimated and assigned to the corresponding intersections with the
Crossroads project. The turning movement volumes at the four way
intersections at Reagan Drive and Congressional Drive are shown in Figures 8
and 9 and were included in assessing the capacity of the intersection.
Prepared by Dobie Engineering, Inc.
. ~- •
FIGURE 4
- CROSSROADS SUBDIVISIOc
1 ~ RAGE DAILY TR AF
PROJECTED AVE
N VEHICLES PER OAY
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~ ~ FUTURE
U
FAIRVIEW AVE.
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~3300~
IAL DRIVE
~S
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~~ . 300 ~-
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I ~ E FILµOR ORI VE
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PINE STREET EXTENSIOrr~
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SCI~LE: 1' ~ 200
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FIGURE A
CROSSROADS SUBDIVISION
N PROJECTED AVERAGE DAILY TRAFFIC
RESIDENTIAL LOTS ONLY
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SC~AI.E: t' ~ 200'