City of Longview Signal Timing Studies

Ocean Beach Highway Signal Timing Optimization: KAI developed and implemented coordinated timing plans for the Ocean Beach Highway corridor, between 9th Avenue and 32nd Avenue, which had previously operated without coordinated timing plans. Additional analyses and design were undertaken to improve the overall safety and capacity of the ten signalized intersections along this corridor. These included phasing modifications at several intersections along the corridor.

KAI staff coded the signal timing plans into the LMD 9200 traffic signal controllers through the central management system (CLMATS) during plan implementation. A before and after study, using Media Access Control (MAC) reader technology, was conducted to evaluate the effectiveness of the implemented timing plans. As a result of the new signal timing, travel time along the corridor decreased by approximately 5 percent to 20 percent during most time periods of the day. The implemented timing plans were well received by City staff, and the community.

15th Avenue and Tennant Way Signal Timing Optimization: The City of Longview elected to apply funds from an Energy Efficiency and Conservation Block Grant to improve signal timings and progression along two corridors: 15th Avenue (11 signals) and Tennant Way (5 signals). The two corridors intersect and were cross coordinated. KAI conducted an evaluation to determine whether these corridors should continue to operate under common time-of-day plans.

Given the traffic patterns prevalent on the two corridors, KAI found there was benefit in maintaining common cycle lengths. A complete review of the basic timing parameters was also conducted to evaluate compliance with current MUTCD guidance, as well as industry best practices. KAI developed new time-of-day plans for both corridors, including revised phasing at several intersections, and implemented those plans in July 2012.