科研之友
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摘要
A structural model for urban arterial roads traffic flow is proposed. It describes the road traffic dynamics in a disaggregated way. The structural model's main components are as follows: (I) A link traffic model that tracks the traffic waves cyclically: Traffic waves within each cycle are captured by three characteristic points. These points are formed when different traffic waves meet. (2) A proportional line model that is used to split the overall outflow into different turning flows: The model is derived directly from the first-in-first-out (FIFO) principle. (3) A spillover component that deals with channelized section queue overflow. (4) A traffic flow performance index component that outputs macroscopic and microscopic-level indexes. These indexes include delays, stops, queue lengths, vehicle trajectories, and travel times. The first three can be used in traffic flow optimization and the last two are valuable in vehicle emissions evaluation. Simulation results show that, with increasing numerical resolution, the traditional CTM (cell transmission model) gradually converges to our model.
