HomeMy WebLinkAboutHICKS SPECIAL REVIEW - COUNTY REFERRAL - 53-88 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDY•
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Leigh, Scott & Cleary, Inc.
TRANSPORTATION PLANNING
& TRAFFIC ENGINEERING CONSULTANTS
Offices in Denver and Colorado Springs
June 2, 1988
Mr. Donald S. Wedum
201 No. Link Lane
Fort Collins, CO 80524
RE
Dear Mr. Wedum:
1889 York Street
Denver, Colorado 80206
(303) 333-1105
Proposed Convenience Store/
Truck Stop
(LSC *880520)
We have completed a traffic access analysis for a proposed convenience
store/truck stop facility to be located immediately southeast of the
I-25/State Highway 392 Interchange in Larimer County, Colorado. Initial
development of the project is planned to consist of a 3,300-square-foot
convenience store with eight gasoline pumps. Future project expansion
would add four gas pump positions for trucks and a 10,000-square-foot
restaurant. Site access is planned at a single location consisting of two
one-way drives separated by a 24-foot median located about 140 feet west of
the east property line. The remainder of this report addresses the
proposed project's access characteristics.
Roadway Characteristics
Figure 1, enclosed, illustrates the site location relative to the
adjacent I-25 Interchange. As shown, the site is located along the south
side of State Highway 392 and immediately east of the I-25 East Frontage
Road.
State Highway 392 is an important east/west highway with continuity
between I-25 and Briggsdale. In the vicinity of I-25, it provides for one
lane in each direction and it is posted with a 40 mph speed limit.
According to 1987 Colorado Division of Highways counts, SH 392 carried an
average of 3,550 vehicles per day just east of I-25. West of I-25, SH 392
becomes a low volume, gravel county road.
The I-25 East Frontage Road is a two-lane north -south roadway with
three miles of continuity between SH 392 and Airport Road. It is posted
with a 55 mph speed limit and a south -facing Stop sign controls Frontage
Road traffic entering SH 392.
Estimated Traffic Generation
Table 1, enclosed, presents estimates of the amount of average daily
and peak -hour traffic likely to be generated by the proposed project. As
Transportation Systems • Transit • Parking • Vehicular Access • Pedestrian & Bicycle Planning • Traffic Operations & Safety • Signal Design • Traffic Impact Studies
Mr. Donald S. Wedum Page 2 June 2, 1988
indicated, a daily total of 2,800 external vehicle -trips are projected
(1,400 entering and 1,400 exiting vehicles). Of these, 144 will enter and
135 will exit during the evening peak hour. These estimates assume that 25
percent of the future restaurant traffic will be generated by motorists who
also stop to purchase gas and/or convenience store items.
Estimated Traffic Distribution
The directional distribution of traffic to be generated by the
proposed development is a function of its location, the type of land uses
proposed, the roadway system providing access, and the site's proposed
access plan. In this instance, it has been assumed that about two-thirds
of the project's traffic will be to and from I-25 with the remainder
oriented towards the east along SH 392. Application of the percent
distribution to the generation estimates of Table 1 results in the
peak -hour and average daily driveway traffic projections shown on Figure 1. -
Alternative Access
As previously stated, full project development includes the addition
of gasoline pumps for trucks. It has been suggested that alternate site
access be considered directly off of the adjacent Frontage Road. In order
to test the viability of this alternative, we have plotted the turning path
of a WB 50 design vehicle (18-wheel semi -tractor trailer truck) on the SH
392/Frontage Road intersection layout. As shown on Figure 2, eastbound-
to-southbound right turns at the intersection occupy virtually all of the
northbound Frontage Road lane before fully entering the southbound lane.
This condition would create safety and congestion problems in the vicinity
of the SH 392/Frontage Road intersection. It is therefore concluded that
Frontage Road truck access is not a desirable alternative to the current
access plan (full access along SH 392).
Conclusions and Recommendations
Based on the preceding analysis, we have reached the following conclusions
and make the following recommendations:
1. The project is expected to be initially developed with a 3,300-
square-foot convenience store with gasoline pumps, and a future
10,000-square-foot restaurant plus separate gas pumps for trucks.
2. Full project development is estimated to generate 1,400 entering
and 1,400 exiting vehicles during an average weekday. Of these,
144 will enter and 135 will exit during the peak hour. The
initial portion of the development will generate less than half
of these totals.
3. About two-thirds of the project -generated traffic is expected to
be oriented towards I-25.
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Mr. Donald S. Wedum
Page 3
June 2, 1988
4. An alternative site access driveway along the adjacent Frontage
Road is not feasible due to the required turning paths of
entering trucks.
5. Left -turn, deceleration and acceleration lanes should be
constructed along SH 392 at the project's entrance driveway in
accordance with requirements of the current State Highway Access
Code.
We trust that this report will assist with further planning for the
proposed convenience store/truck stop. Please call if we can be of
additional assistance.
Respectfully submitted,
LEIGH, SCOTT & CLEARY, INC.
Phili/N. Scd6tt III, P.E.
PNS/mlc
Enclosures: Table 1
Figures 1 and 2
11
Table 1
ESTIMATED TRAFFIC GENERATION
Proposed Convenience Store/Truck Stop
Generation Rates(1) External Vehicle-Trips(2)
------------------------=------ -------------------------------
Assumed A. M. P. M. A. M. P. M.
Trip Average Peak Hour Peak Hour Percent Average Peak Hour Peak Hour 'lei
Weekday --------- ---------- External Weekday ------------------
Land Use Description Units Traffic In Out In Out Traffic Traffic In Out In Out
1. Convenience Store
W/Gas Pumps
Site 1,300
48 48 65
65 100%
1,300
48
48
65 65
2. High -Turn Over,
10 KSF 200.9
10.70 8.41 10.56
9.37 75%
1,500
80
63
79 70
Sit -Down Restaurant
-------------------------------
2,800
128
ill
144 135
NOTES:
(1) Source of generation
rates: "Trip Generation,"
Institute of Transportation
Engineers,
4th Edition;
and
"Trip Characteristics
of Convenience Markets
with Gas Pumps,"
ITE .Journal,
.July 1987.
(2) It is assumed that 25%
of the restaurant traffic
also stops to
purchase gas
and/or convenience
store
items.
•I
30%
to
N
1
APPROXIMATE
SCALE :
t'—' = 200'
7210s 34907 35%
5H-392
3 4
10 90
N%W
PROPOSED PROJECT
Figure 1
Estimated Traffic Distribution
Proposed Convenience Store / Truck Stop
LEGEND :
30% - Estimated Directional Distribution
39/47 - AM Peak -Hour Traffic / PM Peak -Hour Traffic
490 Average Daly Traffic
Leigh, Scott & Cleary, Inc.
3H-392
r � /
SCALE
1,$ = 50' WB 50
WITH 60' TURN
RADIUS
Q i
Q 0 /
O
h O
1 4WL�
Truck Turning Path
Leigh, Scott & Cleary, Inc.