Traffic Organization Methods for Parallel Expressway Exits
Aiming to address the traffic congestion issue of queuing overflow at the exit of parallel expressways,this paper proposes five traffic organization methods for such exits under conditions of no signal control and signal control.By considering the headway distribution of both the main and auxiliary traffic flows,a calculation model for the delay of these flows is derived.From a perspective of scheme selection,with the average delay of vehicles as the evaluation index,the most suitable traffic organization method is examined at the exit of parallel expressways under different traffic flow conditions.The results indicate that when the combined flow of the main road outflow and the auxiliary road traffic of the parallel expressway is below 1500 pcu·h-1,the no-signal control method is recommended.When the traffic volume of the main road outflow is high,giving priority to the main road outflow is recommended;similarly,when the traffic volume of the auxiliary road is high,giving priority to the auxiliary road is recommended.For total flows are[1500,2300]pcu·h-1,a combination of auxiliary road signaling and yield control is recommended.Specifically,when the traffic volume of the main road outflow is substantial,implementing auxiliary road signaling with main road priority is recommended.Conversely,when the traffic volume of the auxiliary road is significant,adopting auxiliary road signaling with auxiliary road priority is preferable.For total flows exceeding 2300 pcu·h-1,full signaling for both the main and auxiliary roads is advocated.
traffic engineeringtraffic scheme selectiontraffic flow theoryurban expresswayegress trafficvehicle delay model
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