HomeMy WebLinkAbout18.0 Traffic AnalysisEXHIBIT 17
Traffic Analysis
Steiner Minor Subdivision
BUI#17022.02
Minor Subdivision Application
December 19, 2019
Basic Traffic Analysis
The purpose of this document is to provide a basic engineered analysis for additional traffic
generated from the proposed Steiner Minor Subdivision in Garfield County, Colorado. The 25.67 Ac.
property is owned by Orchard Creek Ranch, LLC and was previously developed with an
ADU/barn/small apple orchard and a single-family residence. The property is currently accessed from
Canyon Creek Road (CR #137). The Applicant proposes to subdivide the property into two lots, one
for the existing single-family residence and one for the ADU/barn/orchard with the availability for a
future primary single-family residence on the larger ADU/barn/orchard lot. Both lots will continue to
utilize the existing access which was permitted with Garfield County Road and Bridge under Permit
No. GRB19-D-33 (attached). The following Exhibit-1 provides an aerial view of the roadway and
Driveway intersection. No additional driveway accesses are proposed off Canyon Creek Road (CR
#137) for this subdivision.
Civil Engineering
Surveying
& Beyond
�oandarles
SO' Access &
Utility Easement,
Exhibit 1 (Site & Existing Roadways)
Based on surveying information provided by SGM, Inc., the Canyon Creek Road has a paved width of
approximately 22'- 24' and shoulder widths vary from 12" to 24". The posted speed limit is 25 mph
and there no existing sidewalks or public trails.
The Average Daily Trips (ADT) value commonly used in Garfield County for residential dwellings is
9.57 trips per unit. As a point of clarification, this is the value used by the Institute of Traffic
Engineers (ITE) Manual prior to 9th Edition (the value has since been revised to 9.52 trips per unit).
The ADU is a smaller residential dwelling similar to what the ITE classifies as an Apartment (220) at a
value of 6.65 trips per unit. The ITE does not provide any trip estimates for orchards or related
agricultural uses and it is the understanding of Boundaries Unlimited Inc. that the barn/orchard is
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923 Cooper Avenue, Ste. 201 I Glenwood Springs, CO 81601 I 970.945.5252 www.bu-inc.com
Deric J. Walter, PE
Enc.
typically managed and maintained by a single employee. Therefore, the assumption is being made
that the employee generates a similar number of trips as what might be accounted for under General
Light Industrial (110) at a value of 3.02 trips per employee.
Existing and Proposed traffic trip generation has been estimated as follows:
Existing Conditions
Description/ITE Code
*ITE Vehicle Trip Generation Rates
# Units
Total Generated Trips
Weekday
AM Peak
Hour
PM Peak
Hour
Weekday
AM Peak
Hour
PM Peak
Hour
General Light Industrial
(110)
3.02
0.44
0.42
1
3.02
0.44
0.42
Single Family Homes, per
Dwelling Unit (210)
9.57
0.75
1.01
1
9.57
0.75
1.01
Apartment (220)
6.65
0.51
0.62
1
6.65
0.51
0.62
Proposed Conditions
Description/ITE Code
*ITE Vehicle Trip Generation Rates
# Units
Total Generated Trips
Weekday
AM Peak
Hour
PM Peak
Hour
Weekday
AM Peak
Hour
PM Peak
Hour
General Light Industrial
(110)
3.02
0.44
0.42
1
3.02
0.44
0.42
Single Family Homes, per
Dwelling Unit (210)
9.57
0.75
1.01
2
19.14
1.50
2.02
Apartment (220)
6.65
0.51
0.62
1
6.65
0.51
0.62
Trip Increase
9.57
0.75
1.01
*Based on Institute of Traffic Engineers (ITE) Trip Generation Manual, 9th ed.
Table 1, Trip Generation Estimates
Based on information provided by Garfield County Road & Bridge, the 2019 average daily vehicle
trips for Canyon Creek Road (CR #137) is 238 trips. Thus, if and when the future residence is
constructed, the traffic will increase by approximately 9.57 trips per day as calculated in Table 1. This
results in a 4.1% increase. It is interesting to not that the 2014 traffic counts indicated that the daily
traffic was 300 trips which would have resulted in a lesser percentage increase of 3.2%.
Given the minor traffic increase compared to the existing conditions, no roadway or intersection
improvements appear to be warranted to Canyon Creek Road (CR #137) or Highway 6 for this minor
subdivision.
If you have any questions or need additional information, please feel free to contact me at
970.945.5252.
Sincerely,
BOUNDARIES UNLIMITED INC.
i ArOAPP per'; �G JO N W,9! �J't<`
37110
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923 Cooper Avenue, Ste. 201 I Glenwood Springs, CO 81601 I 970.945.5252 I www.bu-inc.com