Before and After-Implementation Studies of Advanced Signal Control Technologies in Florida

BDV32 TWO 977-05The Florida Department of Transportation (FDOT) has proposed the implementation of Adaptive Signal Control Technologies (ASCT) on eight corridors in Florida to overcome the limitations of traditional signal systems in cases of changes in traffic demand, weather, incidents, etc. The main objectives of this project are to evaluate the implementation of proposed ASCT traffic operations at several arterial corridors in Florida, before and after the installation of specific ASCT, document the advantages and disadvantages of different approaches and implementations, and provide recommendations for state-wide implementation of ASCT. The mobility and safety benefits of the ASCT implementation are assessed by comparing performance measures of time of the day (TOD) plans versus ASCT through field data collection. Two critical intersections are identified within each corridor and performance measures such as corridor travel time, intersection delay, major and minor street queues, turning movement etc. are collected. Crash data are collected over a period of fifty-nine months for safety analysis. A Benefit-Cost analysis is conducted by monetizing safety and mobility benefits. The summary field data are used to build regression models of performance measures as functions of site characteristics. Qualitative observations and institutional issues are obtained by interviewing local staff. Recommendations are made on the suitability of corridors for ASCT implementation, and guidelines are provided for effective field implementation