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Santa Ana - Garden Grove Streetcar Project <br />Traffic Study Addendum <br />3.5 Santa Ana Boulevard Street Design Concept Analysis <br />3.5.1 Intersection ICU Analysis <br />A level of service analysis was conducted using the ICU methodology to compare results from the Traffic Impact <br />Assessment (2012) to the new street design concept and is summarized in Table 3-9. <br />Table 3-9 LOS Summary -Street Design Concept (ICU Methodology) <br />llwwPeak <br />Previous Analysis <br />2035 Streetcar <br />Conditions' <br />Street Design Concept <br />2035 Streetcar <br />Conditions' <br />PM Peak <br />Hour Hour <br />AM Peak <br />Hour <br />PM Peak <br />Hour <br />ID <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 />0.84 <br />D <br />0.66 <br />B <br />0.96 <br />E <br />0.05 0.12 <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 />0.58 <br />A <br />0.00 0.00 <br />3* <br />Santa Ana Blvd <br />Shelton St <br />0.46 <br />A <br />0.60 <br />B <br />0.46 <br />A <br />0.60 <br />B <br />0.00 0.00 <br />4 <br />Santa Ana Blvd <br />Flower St <br />0.67 <br />B <br />0.63 <br />B <br />0.71 <br />C <br />0.69 <br />B <br />0.04 0.06 <br />5 <br />Santa Ana Blvd <br />Parton St <br />0.47 <br />A <br />0.43 <br />A <br />0.55 <br />A <br />0.54 <br />A <br />0.08 0.11 <br />6 <br />Santa Ana Blvd <br />Ross St <br />0.61 <br />B <br />0.47 <br />A <br />0.61 <br />B <br />0.59 <br />A <br />0.00 0.12 <br />7 <br />Santa Ana Blvd <br />Bush St <br />0.43 <br />A <br />0.55 <br />A <br />0.53 <br />A <br />0.65 <br />B <br />0.10 0.10 <br />8 <br />Santa Ana Blvd <br />French St <br />0.67 <br />B <br />0.73 <br />C <br />0.67 <br />B <br />0.73 <br />C <br />0.00 0.00 <br />9 <br />Santa Ana Blvd <br />Lacy St <br />0.75 <br />C <br />0.57 <br />A <br />0.75 <br />C <br />0.57 <br />A <br />0.00 0.00 <br />10 <br />Santa Ana Blvd <br />Santiago St <br />0.53 <br />A <br />0.64 <br />B <br />0.53 <br />A <br />0.64 <br />B <br />0.00 0.00 <br />11 <br />Santa Ana Blvd <br />Bristol St <br />0.52 <br />A <br />0.64 <br />A <br />0.61 <br />B <br />0.84 <br />D <br />0.09 0.20 <br />12 <br />Santa Ana Blvd <br />Broadway <br />0.65 <br />B <br />0.63 <br />B <br />0.74 <br />C <br />0.72 <br />C <br />0.09 0.09 <br />13 <br />Santa Ana Blvd <br />Main St <br />0.69 <br />B <br />0.78 <br />C <br />0.76 <br />C <br />0.85 <br />D <br />0.07 1 0.07 <br />Notes: ICU - intersection capacity utilization (volume -to -capacity ratio) <br />* Includes proposed Santa Ana Boulevard reclassification (reduction in eastbound and westbound through lanes from 4 lanes <br />to 2 lanes). <br />+ Configuration reflects the removal of existing WB free right -turn due to proposed station relocation. <br />'Traffic Impact Assessment (October 2012). <br />' Lane configuration based on proposed HNTB Santa Ana Boulevard Street Design Concept. <br />As shown in Table 3-9, the implementation of the proposed Street Design Concept along Santa Ana Boulevard would <br />cause in impact at the intersection of Santa Ana Boulevard/Raitt Street. The street design concept at this location <br />provides one left -turn and one right -turn lane for the westbound approach, where the previous analysis provided <br />two left -turn lanes and one right -turn lane. The reduction in westbound left -turn lanes from two to one lane would <br />cause this location to deteriorate from acceptable LOS D to unacceptable LOS E in the PM peak hour. LOS <br />worksheets are provided in Appendix F. <br />® 16 <br />f�� <br />