Simulation of Vehicle Merging at Urban Freeway Merging Area Based on Dynamical Critical Gap Method
Publication: International Conference on Transportation Engineering 2009
Abstract
Critical gap is generally regarded as a constant in existing expressway merging models, but in reality it is a dynamic variable in real vehicle merging. The reason is that there are significant differences and uncertainties among drivers. Based on the cellular automata model, this paper introduces three types of drivers which include aggressive, cautious and general types, and assumes they act heterogeneously with critical gaps. In addition, critical gap function is modified and applied to model the sequence of decision-making procedures considering the impatience of drivers in the process of waiting for an acceptable gap. According to the established model, the vehicle merging at merge areas can be simulated more accurately. And finally, the velocity-density relationship of the mainline traffic is considered in the condition of forced entry of vehicles from the on-ramp into the mainline. Simulation results show the method based on dynamical critical gap is reasonable and reliable.
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Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Continuum mechanics
- Driver behavior
- Dynamic models
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Highway and road management
- Highway transportation
- Highways and roads
- Infrastructure
- Model accuracy
- Models (by type)
- Motion (dynamics)
- Simulation models
- Solid mechanics
- Traffic engineering
- Transportation engineering
- Uncertainty principles
- Urban and regional development
- Urban areas
- Vehicles
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