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A Study of Three-Lane Cellular Automata Traffic Flow Models

Author: WuDaYan
Tutor: KongLingJiang;LiuMuRen
School: Guangxi Normal University
Course: Theoretical Physics
Keywords: Cellular Automata Traffic flow model Computer simulation
CLC: U491
Type: Master's thesis
Year: 2004
Downloads: 328
Quote: 5
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Abstract


The traffic has been hailed as the \Transportation system planning, design and operational requirements of the transport model to reflect the basic characteristics of the transport phenomena. Cellular automata traffic flow model to achieve the spotlight because of its simple and limited, and convenient computer. Cellular Automata (CellularAutomata, CA), space, time and state discrete nonlinear dynamical systems with simple rules in computer simulation of complex natural phenomena and physical phenomena, and achieved good results inspire people to use it to simulate traffic problems. This paper three-lane highway with a focus on the specific contents are as follows: First, traffic flow model theory, and on this basis, the original NS model application and extended to three-lane freeway traffic flow model, and with periodic boundary conditions, consider the road system is a closed loop, a car from the road segment export to leave immediately from the entrance sections. In the second chapter, the establishment of the three lanes unregulated CA traffic flow model: lane restrictions, three lane carriageway lane vehicles have the same performance, and allow the vehicle to overtake in any lane. Computer numerical simulation results show that, in the same case, the three-lane unregulated traffic flow model diagram shows the traffic flow model than the single-lane NS to control the car in the evolution of the state of the traffic, by determining the probability of vehicle deceleration traffic lane utilization, appropriately selected deceleration probability, can improve the traffic flow situation to improve lane utilization;, different lane changing probability of traffic flow characteristics found to reduce unnecessary lane change behavior can make driving more secure. Then proposed three lanes unregulated CA traffic flow model based on the the first lane provisions super lane, build three lanes the Management CA traffic flow model: lane restriction, first lane super lane, the second The three-lane carriageway, lane vehicles have the same performance, and the vehicle must be traveling in the overtaking lane back to traveling in the second lane. The simulation results show that the case of the same parameters, the three-lane traffic flow characteristics have to manage traffic flow model control traffic flow model similar to three lanes, lane change frequency, there are differences lane utilization, which shows three lanes management The traffic flow model to increase the safety of the driver of the vehicle. Next consider the impact of the slow in the the three lanes unregulated single vehicular traffic flow model based on the proposed traffic flow model of a three-lane unregulated hybrid vehicles CA: lane restrictions three lane carriageway, but in the driveway Vehicles traveling performance is not the same, and to allow these two types of vehicles in any lane overtaking. The results show that: in the case of the same deceleration probability, the three-lane lt; WP = gt; Guangxi Normal University Graduate Thesis control of the hybrid vehicular traffic flow model system flow speed in the low density area between the bicycle lane only Express , only the climbing the NS model (or three lanes unregulated single vehicle traffic flow model) As the density increases, however, the system flow rate corresponding to this model, the speed is greater than the bicycle trail only Express, climbing the case, but in the high-density area, the flow of the three systems, the speed was equal; taking into account the probability of a lane change affect different lane changing probability affect the system flow in a certain density, and as the density increases, lane changing frequency appear peak; When the three-lane traffic slow motion, speed was less than the three-lane only express train traveling, and the critical density point shifted to the right; changing the initial density ratio, no effect on the system traffic. Finally, in the three-lane hybrid vehicles unregulated CA traffic flow model based on the slow initial distribution in the third lane of a three-lane CA traffic flow model of management of hybrid vehicles: lane restrictions lane vehicle performance not the same - Express, slow, but overtaking climbing traveling in the second lane, once the conditions are met, we must return to traveling in the third lane. Computer numerical simulation results show that the unregulated hybrid vehicle deceleration probability the same case, with the three-lane traffic flow model compared to management of hybrid vehicles in the traffic flow model in the three-lane express traffic, the speed increases, and the road capacity greatly improved; taking into account the probability of a lane change affect different lane changing probability had little impact on the volume of traffic and vehicle lane changing behavior occurs mainly in the intermediate density region; When the system as long as there is a slow, corresponding to the maximum flow speed less than a three-lane single Express unregulated; change the initial density than the impact on system traffic density area.

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CLC: > Transportation > Road transport > Technical management of traffic engineering and road transport > Traffic engineering and traffic management
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