2017-046 - Approving Addendum Nos. 1 and 2

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Santa Ana — Garden Grove Streetcar Project Traffic Study Addendum As shown in Table 3-3, the Santa Ana Boulevard station relocation would not cause the affected intersection to deteriorate to unacceptable LOS (the intersection is forecast to operate at acceptable LOS A during the AM and PM peak hours). The LOS worksheets for this intersection are provided in Appendix C. 3.3 Fairview Street Grade Crossing Impact Analysis 3.3.1 Intersection HCM Analysis Table 3-4 shows the results of the intersection VISSIM analysis at the intersections of Fairview Street and Civic Center Drive and Fairview Street and 5th Street. As discussed previously, the LOS reflects the addition of the at - grade street crossing. Table 3-4 Intersection LOS Summary — Fairview Street Grade Crossing Notes: Intersection analysis performed using VISSIM 7 and Highway Capacity Manual (HCM) 2010; delay is expressed in average seconds of delay per vehicle; LOS — Level of Service 'Addition of Fairview Street at -grade street crossing As shown in Table 3-4, the Fairview Street grade crossing would not cause the affected intersections to deteriorate to unacceptable LOS. In most cases, compared to the No Build scenario, vehicle delay is shortened. This is primarily due to signal preemption taking place during streetcar crossing. Gate down times during northbound/southbound movements can create long queues. These high volume northbound/southbound traffic flows must be coordinated with gate uptimes to allow for proper traffic flow. The result of these coordinated green times in the northbound/southbound direction is an overall slight improvement over No Build conditions. Please note for Fairview Street and 5th Street, the AM peak hour street car scenario experiences an increase in delay due to higher volumes of protected left turns in the eastbound/westbound direction slightly reducing the amount of northbound/southbound green times. It is important to clear these eastbound/westbound left turns as their queues can go beyond the pocket length blocking through movement. Outside of signal timing adjustments to Fairview/5th and Fairview/Civic Center Drive, no other design modifications are required. ® 11 f�� Intersection ��r 10111 2035 No Build 9 2035 Streetcar Conditions' AM Peak Hour PM Peak Hour AM Peak Hour PM Peak Hour ID Main St Cross St Delay LOS I Delay LOS Delay LOS Delay I LOS 1 Fairview Street Civic Center Drive 29.7 C 29.7 C 26.7 C 25.2 C 2 Fairview Street 5th Street 47.1 D 59.0 E 50.1 D 53.6 D Notes: Intersection analysis performed using VISSIM 7 and Highway Capacity Manual (HCM) 2010; delay is expressed in average seconds of delay per vehicle; LOS — Level of Service 'Addition of Fairview Street at -grade street crossing As shown in Table 3-4, the Fairview Street grade crossing would not cause the affected intersections to deteriorate to unacceptable LOS. In most cases, compared to the No Build scenario, vehicle delay is shortened. This is primarily due to signal preemption taking place during streetcar crossing. Gate down times during northbound/southbound movements can create long queues. These high volume northbound/southbound traffic flows must be coordinated with gate uptimes to allow for proper traffic flow. The result of these coordinated green times in the northbound/southbound direction is an overall slight improvement over No Build conditions. Please note for Fairview Street and 5th Street, the AM peak hour street car scenario experiences an increase in delay due to higher volumes of protected left turns in the eastbound/westbound direction slightly reducing the amount of northbound/southbound green times. It is important to clear these eastbound/westbound left turns as their queues can go beyond the pocket length blocking through movement. Outside of signal timing adjustments to Fairview/5th and Fairview/Civic Center Drive, no other design modifications are required. ® 11 f��