HomeMy WebLinkAboutHORSETOOTH-TIMBERLINE PROPERTY - MASTER PLAN - 78-88 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDY (2)rkNOV 1W
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MEM0RAND LR 1
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To: Charles Deane
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Eldon blar•d
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Rick Ensdor•ff
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From: Hatt Del i ch _570(�
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Date: November 2, 1988
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Subject: Amendment to Timberline-Horsetooth Property
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Site Access Study
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Particular concerns were raised with the original
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site plan that the left -turn stacking distance on
Horsetooth Road between Timberline Road and the Main
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Access to Horsetooth Road was insufficient to store the
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expected number of left turns. Therefore, a new site
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plan was prepared. The new site plan reorients the uses
and provides better interior circulation which allows
full access to both Timberline and Horsetooth from all
the proposed uses on the site.
In light of the revised site plan for the
Timberline-Horsetooth Property (Figure 1), a reassign-
ment of the long range site generated traffic was
performed. The reassignment of traffic changed a number
of key turning movements. The new long range geometrics
are shot -in in Figure 2. The westbound left -turn lane
requirements at the Main Access are reduced by one-
third. The available distance (stop bar to stop bar) is
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approximately 490 feet. The minimum left -turn lane
requirement is 440 feet (100' + 3401). This would leave
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50 feet for the taper between the left -turn lanes.
Fifty feet is less than the city standard. Given the
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physical constraints, it is recommended that a 90 foot
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taper be used and the westbound left -turn lane be 90
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feet and the eastbound left -turn lane be 310 feet. A
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double eastbound left -turn lane would provide the
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necessary geome tr• i cs. However, the operation of this
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intersection will be at level of service C in the
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morning peak hour and marginally into level of service D
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in the afternoon peak hour. Given the level of analysis
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of this and other traffic studies in this area of Fort
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Collins, an eastbound double left -turn lane is not
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recommended at this time. When/If more definitive
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development proposals are put forth for a number of
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properties within a half mile of this intersection, this
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recommendation should be reevaluated.
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The right-in/right-out access to Parcel G would
require a 310 foot (including taper) deceleration lane
for a 40 mph design speed according to City of Fort
Collins design standards. Using a 10:1 taper design
(120'), the full lane width would be east of the
railroad tracks. This would leave only the taper design
to cross the tracks. According to Figures 4-23 and 4-24
of "Intersection Channelization Design Guide," NCHRP
279, November 1955, a right -turn lane with the volumes
expected would only require a radius (40' for a 15 mph
turn) and a taper. The taper could begin at the
beginning of the curb radius and be 295 feet (at 40 mph
design speed). This design would likely accommodate all
or almost all of the taper between the tracks and the
proposed right-in/right-out access.
If there are any questions regarding any of the
points addressed in this memorandum, do not hesitate to
contact me. I will meet with City Staff at their
request to discuss any of the specific design criteria
mentioned in this memorandum.
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REVISED SITE PLAN FIGURE 1
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REVISED LONG RANGE GEOMETRICS FIGURE 2