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TRAFFIC IMPACT ANALYSIS FAIRVIEW STREET IMPROVEMENTS FROM 9T" STREET TO 16T" STREET AND /\ <br />JUNE 2018 BRIDGE REPLACEMENT PROJECT J" <br />SANTA ANA, CALIFORNIA <br />Appendix A provides the peak -hour intersection turn volumes and a 24-hour daily roadway segment <br />count National Data and Surveying Services collected on Tuesday, December 12, 2017. Figure 4 <br />presents the existing a.m. and p.m. peak -hour volumes for the five study intersections. <br />Consistent with the intersection analysis methodology described previously, existing intersection <br />LOS was calculated for the five study intersections. To calculate their daily LOS, existing daily traffic <br />volumes along the roadway segments between the study intersections were compared against the <br />design capacities of each segment. Table A depicts existing intersection LOS, while Table B shows <br />roadway segment LOS. Appendix B provides intersection LOS worksheets. <br />Table A: Existing Intersection LOS Summary <br />Intersection <br />Existing Conditions <br />AM Peak Hour <br />PM Peak Hour <br />Delay <br />LOS <br />Delay <br />LOS <br />1 <br />Fairview Street/17t Street <br />0.835 <br />D <br />0.902 <br />E <br />2 <br />Fairview Street/16t Street' <br />31.6 <br />D <br />20.0 <br />C <br />3 <br />Fairview Street/12t Street <br />25.1 <br />D <br />19.0 <br />C <br />4 <br />Fairview Street/9t Street <br />>50.0 <br />F <br />47.4 <br />E <br />5 <br />Fairview Street/Civic Center Drive <br />0.642 <br />B <br />0.640 <br />B <br />= unsatisfactory LOS <br />The intersection is unsignalized and was assessed using the HCM methodology. Delay values shown are in seconds per vehicle. <br />LOS = level of service <br />v/c = volume -to -capacity ratio <br />>50.0 = HCM delay value is greater than 50.0 seconds per vehicle, LOS F <br />Table B: Existing ADT Volumes and LOS <br />Roadway Segment I Arterial Type Capacity ADT LOS <br />Existing Conditions <br />17t Street to 16t Street <br />4 Lanes Divided <br />37,500 <br />42,440 <br />F <br />Fairview <br />16t Street to 12t Street— Fairview Bridge <br />4 Lanes Undivided <br />25,000 <br />41,890 <br />F <br />Street <br />12t Street to 9t Street <br />4 Lanes Divided <br />37,500 <br />40,980 <br />F <br />9t Street to Civic Center Drive <br />6 Lanes Divided <br />56,300 <br />41,720 <br />C <br />= unsatisfactory LOS <br />ADT = average daily traffic <br />LOS = level of service <br />v/c = volume -to -capacity <br />As Table A shows, the intersections of Fairview Street/17th Street and Fairview Street/9th Street <br />currently operate at unsatisfactory LOS E or worse during one or both peak hours. The three other <br />study intersections currently operate at satisfactory LOS D or better. It should be noted that the <br />HCM methodology consistent delay values shown for the intersections of Fairview Street at 16th <br />Street, 12th Street, and 9th Street are the calculated wait time of the worst performing movement <br />and not indicative of the experience of the majority of vehicles traveling through these <br />intersections. In the case of these three unsignalized intersections, the worst performing <br />movements are the outbound left -turn movements, of which there are fewer than 10 vehicles per <br />P:\WKE1702\Traffic\doc\Traffic Analysis Report rev - Caltrans Comments.docx u06/07/18» 7 <br />