Highlights Aggregate lane-changing behaviors are captured by a macroscopic model of the number of lane changes. A fundamental diagram of lane-changing traffic is derived and calibrated and validated with NGSIM data. The multi-commodity LWR model of lane-changing traffic flow is solved with a new entropy condition. Lane-changing traffic dynamics are studied inside a lane-drop area. The smoothing effect of HOV lanes is shown to be consistent with observations in existing studies.
Abstract Systematic lane changes can seriously deteriorate traffic safety and efficiency inside lane-drop, merge, and other bottleneck areas. In our previous studies (Jin, 2010a,b), a phenomenological model of lane-changing traffic flow was proposed, calibrated, and analyzed based on a new concept of lane-changing intensity. In this study, we further consider weaving and non-weaving vehicles as two commodities and develop a multi-commodity, behavioral Lighthill–Whitham–Richards (LWR) model of lane-changing traffic flow. Based on a macroscopic model of lane-changing behaviors, we derive a fundamental diagram with parameters determined by car-following and lane-changing characteristics as well as road geometry and traffic composition. We further calibrate and validate fundamental diagrams corresponding to a triangular car-following fundamental diagram with NGSIM data. We introduce an entropy condition for the multi-commodity LWR model and solve the Riemann problem inside a homogeneous lane-changing area. From the Riemann solutions, we derive a flux function in terms of traffic demand and supply. Then we apply the model to study lane-changing traffic dynamics inside a lane-drop area and show that the smoothing effect of HOV lanes is consistent with observations in existing studies. The new theory of lane-changing traffic flow can be readily incorporated into Cell Transmission Model, and this study could lead to better strategies for mitigating bottleneck effects of lane-changing traffic flow.
A multi-commodity Lighthill–Whitham–Richards model of lane-changing traffic flow
Transportation Research Part B: Methodological ; 57 ; 361-377
2013-01-01
17 pages
Article (Journal)
Electronic Resource
English
A multi-commodity Lighthill–Whitham–Richards model of lane-changing traffic flow
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