SU0004091 - Laserfiche WebLink

Home Browse Search

\s ..E 1/11/2001 STUDY INTERSECTIONS This traffic study focuses on intersection operating conditions at the following study intersections. • State Route 120 Eastbound Ramps/Yosemite Avenue (Guthmiller Road) • State Route 120 Westbound Ramps/Yosemite Avenue (Guthmiller Road) Appendix Figure 2 illustrates the existing lane geometrics and control at the study intersections. LEVEL-0F-SERVICE METHODOLOGY Traffic operations have been quantified through the determination of"Level of Service" (LOS). Level of Service is a qualitative measure of traffic operating conditions, whereby a letter grade "A" through "F" is assigned to an intersection or roadway segment representing progressively worsening traffic conditions. — Levels of Service were calculated for different intersection control types using the methods documented in the December 1997 Updated Highway Capacity Manual, Special Report 209, Third Edition. Level of Service definitions for different types of intersection controls are outlined in Appendix Table 1. Peak hour intersection Levels of Service (LOS) and average delays reported in this study for unsignalized two-way- stop-controlled(TWSC) intersections are representative of those for the worst-case movement. The 1997 HCM based LOS analyses procedures were implemented using TRAFFIX 7.1 software program. San Joaquin County has designated LOS "C"as their minimum acceptable LOS standard. _ To determine whether"significance" should be associated with unsignalized intersection level of service, a supplemental traffic signal warrant analysis was also performed. The signal warrant criteria employed for this study are presented in the Caltrans' Traffic Manual. Specifically, this study utilized the Peak- Hour-Volume Warrant 11 (Rural Areas). Though utilization of this warrant may indicate that signalization would be required,the final decision to provide this improvement should be based on further studies utilizing the additional warrants presented in Caltrans Trak Manual. — ANALYSIS SCENARIOS This traffic study analyzes the following scenarios: • Scenario 1 - Existing Conditions • Scenario 2 - Existing plus Approved Project Conditions • Scenario 3 - Existing plus Approved Project plus Project Conditions • Scenario 4 - Year 2010 Base (Without Project) Conditions • Scenario 5 - Year 2010 Base plus Project Conditions Traffic volume data contained in the San Joaquin County certified Oakwood Lake Expansion - Final Environmental Impact Report (Mills Associates, September 2000) has been used extensively in this traffic study. Existing AM and PM peak hour intersection operations (Scenario 1) have been analyzed utilizing the existing "Summer adjusted" peak hour traffic volumes shown on FEIR Figure 4.6-1. All approved projects considered in the FEIR plus the Oakwood Lake residential subdivision have been considered as the updated list of "approved projects" in this traffic study. The Existing plus Approved - -