Laserfiche WebLink
Santa Ana - Garden Grove Streetcar Project <br />Traffic Study Addendum <br />Table 3-7 reports the overall intersection delay changes with implementation of TSP. It should be noted that the <br />delay changes on a movement -by -movement basis were documented in order to determine the appropriate <br />capacity credits and reductions used in the subsequent ICU analysis. On average, application of TSP would increase <br />delay in the AM peak hour by 0.24 seconds and would decrease delay by 0.61 seconds in the PM peak hour <br />throughout the alignment. HCM level of service worksheets are provided in Appendix D. <br />3.4.2 Intersection ICU Analysis <br />Based on the HCM analysis above, the average delay increase (in seconds) for all non -streetcar movements was <br />calculated to be 15 percent. Similarly, all intersection movements that corresponded with the streetcar movements <br />(i.e., eastbound and westbound through movements at affected intersections) experienced an average delay <br />decrease of 15 percent. In order to translate these delay increases/decreases into the ICU methodology, the <br />capacity for each movement was adjusted accordingly. For example, at the intersection of Santa Ana <br />Boulevard/Pacific Avenue, the eastbound and westbound through lane capacity (where the streetcar travels) was <br />increased by 15 percent to reflect the reduction in delay due to transit signal priority. Conversely, all the other <br />intersection movements (northbound/southbound and other turning movements) were effectively decreased by <br />15 percent to reflect the added delay experienced by non -streetcar movements during a preemption event. <br />Table 3-8 Intersection LOS Summary - Transit Signal Priority ICU Methodology <br />Pr Previous Analysis <br />2035 Streetcar <br />Conditions' <br />Transit Signal Priority <br />2035 Streetcar <br />Conditions' <br />MID <br />AM Peak PM Peak <br />Hour Hour <br />AM Peak <br />Hour <br />PM Peak <br />Hour <br />Main St <br />Cross St <br />ICU <br />LOS <br />ICU <br />LOS <br />ICU <br />LOS <br />ICU <br />LOS <br />1* <br />Santa Ana Blvd <br />Raitt St <br />0.61 <br />B <br />0.89 <br />D <br />0.61 <br />B <br />0.85 <br />D <br />+0.01 <br />-0.04 <br />2* <br />Santa Ana Blvd <br />Pacific Ave <br />0.33 <br />A <br />0.58 <br />A <br />0.33 <br />A <br />0.55 <br />A <br />+0.01 <br />-0.03 <br />3* <br />Santa Ana Blvd <br />Bristol St <br />0.61 <br />B <br />0.84 <br />D <br />0.61 <br />B <br />0.85 <br />D <br />0 <br />+0.1 <br />4* <br />Santa Ana Blvd <br />Shelton St <br />0.46 <br />A <br />0.60 <br />B <br />0.46 <br />A <br />0.55 <br />A <br />0 <br />-0.05 <br />5 <br />Santa Ana Blvd <br />Flower St <br />0.67 <br />B <br />0.63 <br />B <br />0.66 <br />B <br />0.61 <br />B <br />-0.01 <br />-0.02 <br />6 <br />Santa Ana Blvd <br />Parton St <br />0.47 <br />A <br />0.43 <br />A <br />0.47 <br />A <br />0.43 <br />A <br />0 <br />0 <br />7 <br />Santa Ana Blvd <br />Ross St <br />0.61 <br />B <br />0.47 <br />A <br />0.59 <br />A <br />0.46 <br />A <br />-0.02 <br />-0.01 <br />8 <br />Santa Ana Blvd <br />Broadway <br />0.74 <br />C <br />0.72 <br />C <br />0.70 <br />C <br />0.68 <br />B <br />-0.4 <br />-0.4 <br />9 <br />Santa Ana Blvd <br />Main St <br />0.76 <br />C <br />0.79 <br />C <br />0.73 <br />C <br />0.82 <br />D <br />-0.3 <br />+0.3 <br />10 <br />Santa Ana Blvd <br />Bush St <br />0.43 <br />A <br />0.55 <br />A <br />0.43 <br />A <br />0.55 <br />A <br />0 <br />0 <br />11 <br />Santa Ana Blvd <br />French St <br />0.67 <br />B <br />0.73 <br />C <br />0.67 <br />B <br />0.74 <br />C <br />0 <br />+0.01 <br />12 <br />Santa Ana Blvd <br />Lacy St <br />0.75 <br />C <br />0.57 <br />A <br />0.76 <br />C <br />0.57 <br />A <br />+0.01 <br />0 <br />13 <br />Santa Ana Blvd <br />Santiago St <br />0.53 <br />A <br />0.64 <br />B <br />0.49 <br />A <br />0.65 <br />B <br />-0.04 <br />+0.01 <br />14 <br />4" St <br />Broadway <br />0.51 <br />A <br />0.53 <br />A <br />0.46 <br />A <br />0.51 <br />A <br />-0.05 <br />-0.02 <br />15 <br />4th St <br />MainStreet <br />0.46 <br />A <br />0.49 <br />A <br />0.43 <br />A <br />0.47 <br />A <br />-0.03 <br />-0.02 <br />16 <br />4th St <br />Bush St <br />0.39 <br />A <br />0.52 <br />A <br />0.39 <br />A <br />0.53 <br />A <br />0 <br />+0.01 <br />