United States Department of Transportation
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Implementation of Proactive Traffic Signal Control System at Multiple Intersections at the Greater Houston Area: Final Report
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2019-03-01
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[PDF-5.98 MB]
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Edition:Final Report April 2017–December 2018
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Abstract:This report summarizes the findings from implementing the proactive signal control system at 30 intersections at four testbeds in the Houston metropolitan area. The work started in April 2017 and the final installation was on December 17, 2018. The final data set was received on January 24, 2019. The data were used evaluate the performance of the implemented proactive signal control system. This project is an extension of Project 0-6920, which proposed a new signal control logic aiming to help vehicles in a platoon more smoothly pass through an intersection at or close to the design speed. Vehicles in a platoon have smaller headways, so the capacity of an intersection could be increased if vehicles in a platoon could pass through the intersection without being interrupted. This logic relies on the existing detecting and control technologies used by TxDOT on Texas roads. Therefore, it is not necessary to test and install new hardware systems, which could be costly and time-consuming, and also may be subject to many uncertainties. Our findings indicate that the proposed proactive signal control worked well when the traffic flow rates were more than 500 veh/hr/lm and the occupancy rates exceeded 0.4. If the flow became less than 350 veh/hr/lm and/or the occupancy rates dropped below 0.20, the new system had insignificant impact on the traffic patterns. When the flow and/or occupancy is low, vehicle movement is more independent, and the arrival pattern tends to be more random. Therefore, the proposed proactive signal control system is not so effective in impacting the traffic patterns at an intersection.
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