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City of Santa Ana i First Street Multimodal Corridor <br /> Technical Memorandum <br /> Daily traffic volume and speed are two metrics by which to analyze the existing traffic along the <br /> corridor and provide the travel patterns throughout the day. Intersections and travel time are two <br /> other key metrics that focus on the traffic during the peak four hours of the day- 7:00 to 9:OOAM <br /> and 4:00 to 6:OOPM. <br /> Two models were used to understand the existing traffic conditions along the corridor. The City <br /> recently updated their Synchro model to update the signal timing along First Street. This model <br /> was used to evaluate the intersection LOS using the Highway Capacity Manual methodology for <br /> urban signalized intersections. This method evaluates the intersection operating conditions in <br /> isolation using the signal timing and volumes collected for the corridor. Table 4 summarizes the <br /> results of the intersection analysis using Synchro. <br /> Table 4. Existing Condition Synchro HCM Results <br /> INTERSECrION AM Peak Hour PM Peak Hour <br /> momm <br /> 1 1s t St.at Bristol St. 49.3 D 55.0 D <br /> 6 1st St.at Flower St. 35.4 D 37.8 D <br /> 8 1st St.at Ross St. 16.3 B 11.3 B <br /> 10 1st St.at Broadway 29.7 C 31.6 C <br /> 11 1st St.atSyca more St. 4.2 A 5.4 A <br /> 12 1s t St.at Mai n St. 43.8 D 36.2 D <br /> 13 1st St.at Bush St. 6.4 A 7.6 A <br /> 14 1s t St.at DT Plaza 14.9 B 28.5 C <br /> 21 1s t St.a t Sta n da rd Ave. 33.3 C 26.0 C <br /> 22 1st St.atGrandAve. 40.9 D 39.2 D <br /> 25 1s t St.at Lyon St. 24.0 C 16.0 B <br /> 26 1s t St.a t Zo o Ln. 28.0 C 32.3 C <br /> 27 1st St.at1-5SB 6.1 A 28.9 C <br /> 28 1st St.atCabrIIloParkDr. 19.3 B 22.0 C <br /> 29 1st St.atGoI den CircleDr. 19.6 B 14.3 B <br /> 30 1st St.atTustinAve. 21.6 C 26.1 C <br /> The analysis shows that all intersections along the corridor operate at LOS D or better during <br /> the peak hours. The greatest level of congestion is reported from Grand Avenue to Zoo Lane <br /> approaching the 1-5 southbound freeway ramps. <br /> The second model used to assess the operating conditions along the corridor is a <br /> microsimulation model VISSIM. This tool simulates vehicle travel along the corridor based on <br /> driver behavior assumptions.Where as Synchro looks at the volume at each intersection, <br /> 16 <br />