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<br />City of Santa Ana | First Street Multimodal Corridor <br />Technical Memorandum <br /> <br />16 <br /> <br />Intersection Analysis <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 9:00AM <br />and 4:00 to 6:00PM. <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 /># INTERSECTION AM Peak Hour PM Peak Hour <br /> Delay <br />(s) LOS Delay <br />(s) LOS <br /> <br />1 1st 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. at Sycamore St. 4.2 A 5.4 A <br />12 1st St. at Main St. 43.8 D 36.2 D <br />13 1st St. at Bush St. 6.4 A 7.6 A <br />14 1st St. at DT Plaza 14.9 B 28.5 C <br />21 1st St. at Standard Ave. 33.3 C 26.0 C <br />22 1st St. at Grand Ave. 40.9 D 39.2 D <br />25 1st St. at Lyon St. 24.0 C 16.0 B <br />26 1st St. at Zoo Ln. 28.0 C 32.3 C <br />27 1st St. at I -5 SB 6.1 A 28.9 C <br />28 1st St. at Cabrillo Park Dr. 19.3 B 22.0 C <br />29 1st St. at Golden Circle Dr. 19.6 B 14.3 B <br />30 1st St. at Tustin Ave. 21.6 C 26.1 C <br /> <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 I-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,