AgdaPkt 2016-11-07 Joint SA PFA - Laserfiche WebLink

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Page 11 Average Vehicle Delay Average vehicle delay was collected at four key intersections along the project corridor. The majority of the vehicle delay typically occurs at controlled intersections. Therefore, the average vehicle delay provides another way to represent travel time changes as a result of the pilot project and incorporates delays experienced by drivers entering the corridor. Average vehicle delay is the average time it takes vehicles on all intersection approaches (including cross‐streets) to pass through the intersection. The morning peak hour was selected for the analysis because volumes are highest during the morning period and the results illustrate the highest anticipated levels of delay. Average vehicle delay is a standard output from Synchro, a traffic analysis and modeling software program. Traffic volumes, lane configurations, and signal timing parameters before and after the pilot were inputs into Synchro. Outcome: The calculated delays are summarized in Table 8. Table 8: Average Intersection Vehicle Delay during Morning Peak Hour Intersection Average Vehicle Delay (seconds) Pre-Pilot Post-Pilot Change Farm Hill Boulevard at Emerald Hill Road1 36.6 36.5 -0.1 Farm Hill Boulevard at Glennan Drive 7.2 7.5 0.3 Farm Hill Boulevard at McGarvey Avenue 9.0 25.6 16.6 Farm Hill Boulevard at Jefferson Avenue 8.5 18.5 10.0 1The intersection of Farm Hill Boulevard and Emerald Hill road is an unsignalized intersection. Sources: City of Redwood City, Synchro model (December 2015) Quality Traffic Data (May 27‐28, 2015 and July 13, 2016). Average vehicle delay increased for the three signalized intersections after the pilot project in May 2016 as compared to the Pre-Pilot in May 2015. Delay increases ranged from 0.3 to 16.6 seconds, with the largest increase at the intersection of Farm Hill Boulevard and McGarvey Avenue. Although the average intersection delay increased by 16.6 seconds, the intersection still averages only 25.6 seconds of delay, which is an acceptable level based on City guidelines. Note that these results are different than the travel time results because average vehicle delay is: 1) only capturing intersection delays (as opposed to delay experienced between intersections), and 2) it accounts for delays to vehicles on side streets while the travel times studies only reflect conditions for vehicles traveling on the pilot corridor. It should also be noted that the volumes used in the intersection delay analysis were collected in May 2015 for the Pre-Pilot and in May 2016 for the Post-Pilot, while the travel time surveys by TJKM Traffic Consultants were collected in July 2015 for the Pre-Pilot and July and September 2016 for the Post-Pilot. 8.A. - Page 22