Santa Clara Agrihood Traffic Operations Analysis
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Santa Clara Agrihood Traffic Operations Analysis Prepared for: David J. Powers & Associates, Inc. March 29, 2018 Hexagon Transportation Consultants, Inc. Hexagon Office: 4 North Second Street, Suite 400 San Jose, CA 95113 Hexagon Job Number: 15GB42 Phone: 408.971.6100 Client Name: David J. Powers & Associates, Inc. Santa Clara Agrihood – Traffic Operations Analysis March 29, 2018 Table of Contents Executive Summary ................................................................................................................................... i 1. Introduction ...................................................................................................................................... 1 2. Existing Conditions ........................................................................................................................... 9 3. Background Conditions .................................................................................................................. 16 4. Existing Plus Project Conditions .................................................................................................... 19 5. Background Plus Project Conditions .............................................................................................. 26 6. Other Transportation Issues .......................................................................................................... 32 7. Conclusions ................................................................................................................................... 42 Appendices Appendix A Traffic Counts Appendix B Approved Trip inventory and Approved Projects Appendix C Intersection Volume Summary Appendix D Level of Service Calculations Appendix E Vehicle Queuing Calculations List of Tables Table ES 1 Intersection Level of Service Summary ............................................................................. iii Table 1 Signalized Intersection Level of Service Definitions Based on Control Delay ........................ 6 Table 2 Existing Intersection Levels of Service ................................................................................ 13 Table 3 Background Intersection Levels of Service .......................................................................... 17 Table 4 Project Trip Generation Estimates ....................................................................................... 21 Table 5 Existing Plus Project Intersection Levels of Service ............................................................ 22 Table 6 Background Plus Project Intersection Levels of Service ...................................................... 28 Table 7 Freeway Segment Capacity .................................................................................................31 Table 8 Vehicle Queue and Left-turn Storage Capacity ................................................................... 33 Table 9 Transit Vehicle Delay Summary ........................................................................................... 38 Table 10 Freeway Off-Ramp Queueing Analysis ................................................................................ 39 Table 11 Freeway Ramp Analysis ......................................................................................................41 List of Figures Figure 1 Site Location and Study Intersections .................................................................................... 2 Figure 2 Project Site Plan .................................................................................................................... 3 Figure 3 Existing Transit Services ...................................................................................................... 11 Figure 4 Existing Lane Configurations ............................................................................................... 14 Figure 5 Existing Traffic Volumes ...................................................................................................... 15 Figure 6 Background Traffic Volumes ................................................................................................ 18 Figure 7 Project Trip Distribution ........................................................................................................ 23 Figure 8 Net Project Trip Assignment ................................................................................................ 24 Figure 9 Existing Plus Project Traffic Volumes ..................................................................................25 Figure 10 Background Plus Project Traffic Volumes ........................................................................... 27 Figure 11 Project Trips at Site Access Points ...................................................................................... 35 Santa Clara Agrihood – Traffic Operations Analysis March 29, 2018 Executive Summary This report presents the results of the Traffic Operations Analysis (TOA) conducted for the proposed Santa Clara Agrihood development at 90 N. Winchester Boulevard in Santa Clara, California. The 5.8- acre site is located on the southwest corner of the Winchester Boulevard and Worthington Circle intersection. A portion of the site is proposed for 165 affordable senior housing units, which already have been approved and are included in the background traffic estimates. The remainder of the site is proposed for an additional 36 townhomes, 160 apartment units, and a 1,650-s.f. community cafe. The project also includes a 1.5-acre agricultural open space. The project site is currently vacant. Vehicle access to the proposed project would come from two driveways on Worthington Circle and one full- access driveway on Winchester Boulevard. The driveway on the east-west portion of Worthington Circle would serve inbound traffic only. This study was conducted for the purpose of identifying the potential traffic impacts related to the proposed development. The potential impacts of the project were evaluated in accordance with the standards set forth by the City of San Jose and the Santa Clara Valley Transportation Authority. The VTA administers the County Congestion Management Program (CMP). Since the proposed project is not projected to generate 100 or more net new peak-hour trips, a CMP analysis, which includes a freeway level of service analysis and a future growth analysis, is not required. However, per CMP guidelines, an analysis to document the determination that a freeway level of service analysis is not required is included within the following sections. The traffic study includes an analysis of AM and PM peak hour traffic conditions for thirteen (13) signalized intersections and three (3) freeway ramps in the vicinity of the project site. All of these intersections are located in San Jose. Project Trip Generation Based on the ITE trip generation rates and applicable reductions, it is estimated that the proposed project would generate 1,146 daily trips, with 79 trips (24 inbound and 55 outbound) occurring during the AM peak hour and 94 trips (59 inbound and 35 outbound) occurring during the PM peak hour. Level of Service Analysis at Signalized Intersections Table ES-1 summarizes the results of the intersection level of service analysis under background plus project conditions. The results show that one intersection located within the City of San Jose would be significantly impacted by the project, according to City of San Jose impact criteria. The impact and proposed improvements to mitigate the impact are described below. Page | i Santa Clara Agrihood – Traffic Operations Analysis March 29, 2018 Winchester Boulevard and Stevens Creek Boulevard Mitigation Measure: The intersection of Winchester Boulevard and Stevens Creek Boulevard has been identified as a City of San Jose Protected Intersection. Thus, in lieu of physical mitigations at the Winchester Boulevard and Stevens Creek Boulevard intersection, San Jose requires projects to construct offsetting improvements to other parts of the transportation system in the area to improve system-wide roadway capacity or to enhance non-auto travel modes in furtherance of the General Plan goals and policies. Freeway Segment Analysis Per CMP technical guidelines, freeway segment level of service analysis shall be conducted on all segments to which the project is projected to add one percent or more to the segment capacity. Since the project is not projected to add one percent to any freeway segments in the area, freeway analysis for the CMP was not required. Vehicle Queuing The analysis of intersection levels of service was supplemented with a vehicle queuing analysis for left turn lanes at signalized intersections where the project would add a substantial number of trips to the turn movements. The queuing analysis indicated that the estimated maximum vehicle queues would exceed the vehicle storage capacity at one intersection. No queuing issues were identified. Site Access Site access was evaluated to determine the adequacy of the proposed site driveways with regard to delay, queuing, and sight distance. The following improvements were recommended: Recommendation: Since left-turns out would create a potential safety issue along Winchester Boulevard, the City of Santa recommends disallowing left-turns out at the Winchester Boulevard driveway and making both driveways on Worthington Circle full access to serve traffic heading northbound on Winchester Boulevard and heading eastbound on Forest Avenue. Recommendation: Red curb markings should