Item 12 - Select Locally Preferred Alternative for the First Street Multimodal Boulevard Study

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FN City of Santa Ana I First Street Multimodal Corridor Technical Memorandum West Side Design Yea, For all study scenarios,the future year volumes are based on an average growth rate of 0.6% per year applied to the existing ground count traffic volumes, which suggest no changes in traffic patterns over the next 22 years. The results of the Design Year analysis indicate that with the reduction in lanes to either five lanes or six lanes, there will be a significant increase in delays if traffic patterns remain unchanged. The City is currently working with OCTA to run the OCTAM model for the five lane and the four-lane with bus lane conditions to determine if the lane reduction would result in a redistribution of traffic to other routes. As this is currently a grid network and there are several parallel or alternative routes in the area, this model will help provide more accurate long-term travel patterns. Results of the Enhanced Pedestrian and Bicycle Concept and Bus Lane/Bike Lane Concept will be re- evaluated once the model runs are completed. East Side Analysis Operational analysis for the east side evaluated the baseline six-lane option and the proposed four-lane option. The results of the analysis show that all intersections east of 1-5 are forecast to operate at LOS D or better with the four lanes under both Opening Year and Design Year Conditions. travel Time Analysis Travel time calculations were conducted for the west side (Bristol Street to Zoo Lane) and the east side (Zoo Lane to Tustin Avenue) for the Opening Year and Horizon Year for all study scenarios. Travel times were calculated for both buses and passenger vehicles in order to understand the benefits and the impacts to each mode. Tables 13 and 14 summarize the Opening Year and Design Year travel times for the corridor for automobiles and Tables 15 and 16 report the same data for buses. 52