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<br />City of Santa Ana | First Street Multimodal Corridor <br />Technical Memorandum <br /> <br />14 <br /> <br />Figure 6. Distribution of Volume Across a 24-Hour Period <br /> <br />Traffic Speeds <br />The posted speed limit along First Street is primarily 40mph in each direction. Table 3 shows the <br />85th percentile or prevailing speed along the corridor. As shown, the 85th percentile is generally <br />within 5 mph of the posted speed limit. <br />Table 3. 85th Percentile Speeds by Study Segment <br />Segment <br />85th Percentile Speed (miles per <br />hour) Vehicles Per <br />Day Traveling <br />Over 40 mph <br />(% of ADT) EB WB Total <br />Baker Street to Shelton Street 41 40 40 5,899 (15%) <br />Parton Street to Ross Street 41 41 41 7,158 (18%) <br />West of Spurgeon Street 37 35 36 2,087 (6%) <br />East of Garfield Street 42 44 43 8,687 (26%) <br />Standard Avenue to Grand Avenue 42 40 41 6,017 (18%) <br />West of Wright Street 43 42 43 8,160 (24%) <br />West of Cabrillo Park Drive 40 38 39 2,754 (11%) <br />Golden Circle Drive to Tustin <br />Avenue <br />42 40 41 3,525 (18%) <br /> <br />While the 85th percentile speeds are within a reasonable range of the posted speed limit, many <br />vehicles were recorded traveling at or above the posted 40 mph speed limit. These excessive <br />speeds tend to occur outside of the peak hours when the volume on the roadway is well below <br />capacity. The lack of traffic and friction that is caused by the proximity of vehicles close to one <br />another results in drivers traveling faster than the posted speed limit – even when they are not <br />aware they are doing so. <br />0 <br />500 <br />1000 <br />1500 <br />2000 <br />2500 <br />3000 <br />3500 <br />0:001:002:003:004:005:006:007:008:009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00Vehicles Per Hour <br />Parton Street to Ross Street Golden Circle Drive to Tustin Avenue