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CJ Level of Service Analysis Methodology • Levels of service ratings are qualitative descriptions of intersection operations and are reported using an A through F letter rating system to describe travel delay and congestion. Level of Service (LOS) A indicates free flow conditions with little or no delay and LOS F indicates congested conditions with excessive delays and long back-ups. The operating conditions at .the signalized study intersections were evaluated using the 1994 Highway Capacity Manual (HCM) methodology. Peak hour intersection conditions are reported as the average delay in seconds per vehicle with corresponding levels of service. The operating conditions at the intersection of Davis Street/Carpentier Street were evaluated using the 1994 HCM methodology for unsignalized intersections. This methodology produces an average delay and a corresponding LOS for the entire intersection. Appendix A contains a detailed description of the methodologies. Impact Criteria The City of San Leandro prefers to have its roadways and intersections operate at a minimum of Level of Service D. Roadways that are expected to fall below this threshold by the proposed development must be improved to meet the city's standard. Therefore, any roadway or intersection that is shown to drop below the LOS D minimum standard will require mitigation measures as a part of the project approval. Results of Level of Service Analysis Turning movement counts for the a.m. and p.m. peak hours for all existing study intersections were conducted by TJKM in October of 1999. Figure 2 illustrates the existing peak hour turning movements for the existing study intersections. Table I summarizes the results of the intersection analysis for existing conditions. All of the study intersections, except Davis Street/Carpentier Street, currently operate at acceptable service levels (LOS D or better) during the peak hours. Davis Street/Carpentier Street currently operates at LOS F during the a.m. and p.m. peak hours. The westbound Davis Street left turn movement experiences the greatest delays. However, with an exclusive westbound left-turn lane, the intersection of Davis Street/ Carpentier Street would operate acceptably at LOS C during the peak hours. It appears that a 50-foot westbound left-turn lane can be installed by restriping the east leg of the .intersection. The detailed calculations of the level of service analysis are contained in Appendix B. ~~ San Leandro Creekside Plaza Business Park Traffic Study Page 5 TJKM Transportation Consultants October 26, 1999