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HomeMy WebLinkAboutBOARDWALK CROSSING FILING 2 MINOR SUBDIVISION - 76 93 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDY. V.':. for this property. It is concluded that the auxiliary lane required for the proposed right-in/right-out access to College Avenue meets sound engineering design criteria for the posted speed on College Avenue and the expected turning speed at the access. the north will shorten the right -turn auxiliary that will be associated with this access. According to available aerial photography and site plans, a taper for an auxiliary lane begins approximately 80 feet south of the centerline of Boardwalk Drive. The photography and site plan show a taper length of 90 feet. This portion is built. The distance from the end of the taper to the beginning of a 40 foot radius arc for this proposed access is 250 feet. Therefore, the available lane and taper will be 340 feet. According to the "State Highway Access Code" (SHAG), the auxiliary lane at this location should be 295 feet (40 mph) with a 15:1 taper (desirable - 1801). Based upon traffic studies for this property, the right -turn movement would be 24 and 38 vehicles in the respective peak hours, resulting in a design hourly volume (DHV) of 31. According to the SHAG, this DHV would require summing the auxiliary lane and the taper, resulting in a total length of 475 feet. It is pertinent to understand how the deceleration lane length (295') from the SHAC was determined. This length involves two calculations. The first involves the perception -reaction time needed to begin the deceleration process. The second is the actual deceleration from the posted speed (40 mph) to the turning speed. In this case, it is 15 mph for a 40 foot radius curb return. At 40 mph, the perception -reaction time is half (1471) of the length of the deceleration lane. The perception -reaction time, in this case, is the amount of time necessary for the driver to realize that he wants to make the turn and then begin to apply the brakes. The above perception -reaction length assumes a time of 2.5 seconds. This length of time was determined through research pertaining to stopping sight distance. This pertains to an unexpected occurrence. In the case of entering a commercial area, the occurrence is expected. Research indicates that the 85th percentile driver reaction time for an expected occurrence is 66% of the unexpected occurrence. Therefore, it is reasonable to use less time (1.7 seconds). This reduces the length covered to 100 feet rather than 147 feet. This results in a length of deceleration lane of 248 feet (148' + 1001). This may be rounded to 250 feet for design purposes. Based upon the above information, it is concluded that the available length of right -turn auxiliary lane (2501) is sufficient for a vehicle to decelerate from 40 mph to 15 mph without negatively impacting the through traffic on College Avenue. The existing taper angle, which results in a 90 foot taper length is less than that required by the SHAC. Ninety feet is generally accepted as a reasonable length of taper in urban areas, but will likely require a variance to the SHAC. Conclusion. It is concluded that the proposed REI retail building is in conformance with trip generation used in the previous traffic study Ui V J W O W 2 H Q Z c To: r a 10 Io Cl) From: Cn c7 z LL, W z CD z W J U z O Q F- Q 0 a Z z a s U LL LL cc Date: Subject: MEMORANDUM Eldon Ward, Cityscape Fort Collins Staff Matt Delich -WE-1) November 1, 1993 REI traffic study (File: 9382MEM1) This memorandum documents various traffic analyses related to the REI retail building, located in the southwest quadrant of the College/Boardwalk intersection. The "Traffic Impact and Accessibility Analysis, Garth Commercial Plaza," December 1982, by Leigh, Scott, & Cleary, Inc. was reviewed as part of this analysis. Specifically, this memorandum addresses: (1) compliance of the proposed use to the uses assumed in the previous study, and (2) compliance with the "South College Avenue Access Control Plan." Trip Generation The REI retail building will house a recreational equipment store. This is considered a specialty retail use. Institute of Transportation Engineers' research indicates that specialty retail uses have a significantly lower trip generation rate compared to shopping center type retail uses. The rate can be as much as half the shopping center rate. The REI building area will be 30,600 square feet at full development. This is more than the 16,500 square feet of retail use in the cited traffic study. However, the fast food restaurant used in the cited traffic study was twice the size of the existing KFC restaurant. Assuming all other uses from the cited traffic study remain the same, the trips generated from the additional retail space are in general conformance with the overall trip generation. Access to South College Avenue I have been requested to comment on the access to the REI site as it relates to the "South College Avenue Access Control Plan." The REI Site Plan shows a right-in/right-out access located approximately 470 feet south of the centerline of Boardwalk Drive. The "South College Avenue Access Control Plan" shows this right-in/right-out access 810 feet north of the centerline of Troutman Parkway. This would place the allowed access 650 feet south of the centerline of Boardwalk Drive. The location of the proposed access is approximately 180 feet north of the allowed location. This relocation to W V J W O W Q CD r 10 01 co z s w w z z w _J 7 U Z O Q cc x 0 LL N Z Q Q H U LL LL Q CL N MEMORANDUM To: Kerrie Ashbeck, Fort Collins Development Engineer Teresa Jones, CDOT Eldon Ward, Cityscape Steve Olt, Fort Collins Planning Department Rick Ensdorff, Fort Collins Transportation Division From: Matt Delich Date: January 27, 1994 Subject: REI traffic study proposal (File: 9382MEM2) The purpose of this memorandum is to state the proposed auxiliary lane configuration for the Boardwalk Crossing access. This access is located 465+ feet south of Boardwalk (centerline to centerline). This lane will have the following elements: Radius - 40 feet Length of full width lane - 250 feet Taper - 90 feet I have attached my November 1, 1993 memorandum in which I discussed the auxiliary lane design considerations.