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2dsim: A Prototype Of Nanoscopic Traffic Simulation, Daiheng Ni
2dsim: A Prototype Of Nanoscopic Traffic Simulation, Daiheng Ni
Daiheng Ni
This paper reviews and compares car-following and lane- changing logics embedded in some microscopic traffic simulation models, and comments are made on the existing techniques of traffic simulation. Future directions of traffic simulation are identified in three aspects: vehicle modeling, driver modeling, and vehicle movement modeling. To illustrate these ideas, a conceptual model, 2DSIM, is proposed, which consists of a dynamic vehicle sub-model and an intelligent driver sub-model. They are further integrated into a driver-vehicle-environment closed-loop system which constitutes the basic building block of road traffic.
Simulation Of Freeway Merging And Diverging Behavior, Daiheng Ni, John D. Leonard
Simulation Of Freeway Merging And Diverging Behavior, Daiheng Ni, John D. Leonard
Daiheng Ni
Simplified theory of kinematic waves was proposed by Newell and uses cumulative arrival and departure counts to describe kinematic waves of freeway traffic. The original paper deals only with traffic on freeway mainline. It is of great interest, at least practically, to investigate whether the simplified theory can be used to simulate freeway traffic merging and diverging behavior. In his paper, Newell as- sumed that on-ramp traffic always has the priority and can bypass queues, if any. This assumption will be released so that traffic from the mainline and the on-ramp will have to compete for downstream supply. For off-ramps, …