SR 05:240 - Laserfiche WebLink

APPENDIX B Assumed Intersection Changes to Reduce Delay in Various Network Alternatives The Level of Service tables provided in this report assume the following intersection changes are in place by the Year 2025 to help reduce congestion, stops and delay at the study intersections. Modification or deletion of any of these assumptions will result in changes to the LOS tables, with increases in delay and congestion in most cases. These assumptions are similar in nature to the changes shown in the 1996 General Plan in Figures 1II-5, 11I-6 and 111-7 that detail the assumed roadway widening, new traffic signals, and intersection widening anticipated for the future, and assumed for the purpose of calculating the LOS values in that 1996 document and subsequent Traffic Baseline Reports. The circulation system changes described below are not necessarily recommended for immediate construction, but would be constructed over the next 20 years as they became necessary. Inclusion of these projects allows the City to collect traffic mitigation fees to cover much of the design and construction cost for this work, and allows the City to acquire right-of-way and require roadway improvements by developers as property is improved or redeveloped. This minimizes the impact to the City's General Fund when construction of these projects becomes necessary to maintain the City's adopted congestion management standards. Triple Left Turns Pleasanton currently has a triple left turn from southbound Stoneridge Mall Road to eastbound Stoneridge Drive. Staff's review of traffic collisions at triple left turns compared to double left turn lanes indicates that triple left turns are just as safe if designed properly. Double left turn lanes are recommended when left turn traffic volumes reach 300 vehicles per hour. Pleasanton has existing and future left turn volumes that exceed 600 vehicles per hour. Using triple left turns can significantly reduce delay, and left turn pocket overflow into adjacent through lanes, while maximizing landscaped median area. Bemal Avenue at Angela Street Mitigation - Right Turn Only restrictions from 7-9 AM and 4:40-6:30 PM In all Year 2025 scenarios, the flow of traffic along Bernal Avenue becomes so continuous, that not enough gaps are available for drivers on Angela Street to turn left or go straight through the intersection. The extreme delay on Angela Street creates LOS F conditions at the intersection. This increases traffic risks for all drivers at the intersection as Angela Street traffic tries to force its way across Bernal Avenue through inadequate gaps in 35 MPH traffic. Limiting Angela Street traffic to right turns only during the morning and evening peak hours would increase traffic safety and reduce delay to LOS A conditions overall. Building a traffic signal would also improve conditions to LOS C or better, but would increase stops and delay along Bemal Avenue. Bernal Avenue at Case Avenue Mitigation - Widen southbound to provide a right turn only lane The 1996 General Plan includes the widening of Bernal Avenue to provide a third southbound lane. This new lane should be striped as a right turn only lane and should be constructed at the time the vacant property on the northwest comer is developed.