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Tai Tam Road connects the districts of Chai Wan and Stanley on Hong Kong Island. A section of the road runs along the narrow dam of Tai Tam Tuk Reservoir, making it challenging to accommodate the traffic flow adequately. The dam was used to feature two-way traffic, which was problematic when buses crossed ways with other bigger vehicles, causing heavy congestion.
Tai Tam
Road
Before 2018
In 2018, the smart traffic light on each side of the dam were developed, jointly by Transport Department, Chinese University of Hong Kong, and the Logistics and Supply Chain MultiTech R&D Centre (LSCM), to solve the congestion problem.
However, since the dam is nearly 400 meters long, if traffic lights are used to control the traffic flow at both ends of the dam, only one vehicle is allowed to pass through the dam at any time, and the other vehicle needs to wait for the green light time of the other party to complete and the last vehicle to leave the dam. Therefore the waiting time will be up to 5 minutes.
Solutions
Traffic flow and signal data were given to the DISCO team for evaluation. We developed the micro-simulation model with the ability to replicate the adaptive control logic. The evaluation shows the promising performance of the adaptive control logic developed by CUHK/LSCM compared to a fixed-time plan. The method opens up the possibility for evaluating other intelligent junctions with adaptive control logic in a micro-simulation platform.