HomeMy WebLinkAboutHORSETOOTH EAST BUSINESS PARK, 2ND FILING - FINAL PUD - 43-94F - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDYHORSETOOTH ROAD
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DECELERATION LANE DESIGN Figure 3
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SHORT RANGE PEAK HOUR TRAFFIC Figure 2
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BIG HORN DR.
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SITE PLAN Figure 1
mph turn, thus decreasing the overall length required for deceleration. Using Figure 6-2 from
TramWrtation and Land Development, Stover/Koepke, ITE, 1988, the length of a full lane
is 130 feet and the length of the taper is 100 feet for 45 mph. The total of 230 feet is less than
the City standard. I am recommending a combination of 130 feet of full lane (from ITE) and
180 feet of taper (from the City), which results in a total deceleration length of 310 feet. The
Timberline/Iiorsetooth curb return radius scales at 30 feet from available drawings.
Therefore, the 310 foot deceleration lane and taper will allow 45 feet of tangent between the
Timberline/Ilorsetooth curb return P.C. and the start of the taper. This design will safely
allow vehicles to decelerate before making the right turn into this access.
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MEMORANDUM
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TO: Libby Glass, W.W. Reynolds Companies
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Eldon Ward, Cityscape Urban Design
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Jade Miller, Northern Engineering Services
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City of Fort Collins Staff
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FROM: Matt Delich
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DATE: April 3, 1998
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SUBJECT: Horsetooth East Business Park traffic study addendum
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(File:94113ME02)
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I have been requested to evaluate the geometric requirements at the right-in/right-out
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to the Horsetooth East Business Park from Timberline Road. From available
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engineering and site plan information, Timberline Road is 70 feet wide and the centerline of
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the proposed access is 450 feet south of the south curb of Horsetooth Road. This access is
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the street from a similar access to a future commercial center on the east side of
Timberline Road. Figure I shows a general site plan of the lorsetooth East Business Park.
There is an existing gas/convenience store and car wash, as shown on the plan. There are one
or more buildings proposed in Parcel C, which precipitated addressing this right-in/right-out
access at this time.
Figure 2 shows the short range peak hour traffic at the key intersections. This is
termed short range, since the through volumes on both Timberline Road and Horsetooth
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Road are not at a 20 year future forecast. The long range forecast is not necessary to conduct
the geometric analysis herein described. Using Figure 4-23 from "Intersection Channelization
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Design Guide," NCHRP 279, TRB, a full width right -turn lane is needed at the proposed
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right-in/right-out access. This will remove right -turning vehicles from the through lane, which
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will reduce the likelihood of rear -end accidents associated with this turning movement.
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Timberline Road is an arterial street. According to City design criteria, the design
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speed for an arterial street is 50 mph and the deceleration lane length is 500 feet, including
taper. This length would go through the Timberline/Horsetooth intersection. This is not
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practical. Timberline Road is posted at 40 mph. Using tlus as the design speed results in a
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deceleration lane length of 370 feet including taper. From the P.C. of the curb return at the
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proposed access, a length of 370 feet would fall in the Timberlinehiorsetooth curb return.
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This would not be a good design.
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The recommended deceleration lane design is shown in Figure 3. Since the curb
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return for the proposed access has a radius of 50 feet, a higher exit speed can be expected.
A radius of 40 feet allows for a turning speed of 15 mph. The larger radius would allow a 20