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Chin. Phys. B, 2008, Vol. 17(8): 3014-3020    DOI: 10.1088/1674-1056/17/8/042

Phase transition on speed limit traffic with slope

Li Xing-Li(李兴莉)a), Song Tao(宋涛)a), Kuang Hua(邝华)a)b), and Dai Shi-Qiang(戴世强)a)
a Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China; b Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;College of Physics and Electronic Engineering, Guangxi Normal University, Guilin 541004, China
Abstract  Through introducing a generalized optimal speed function to consider spatial position, slope grade and variable safe headway, the effect of slope in a single-lane highway on the traffic flow is investigated with the extended optimal speed model. The theoretical analysis and simulation results show that the flux of the whole road with the upgrade (or downgrade) increases linearly with density, saturates at a critical density, then maintains this saturated value in a certain density range and finally decreases with density. The value of saturated flux is equal to the maximum flux of the upgrade (or downgrade) without considering the slight influence of the driver's sensitivity. And the fundamental diagrams also depend on sensitivity, slope grade and slope length. The spatiotemporal pattern gives the segregation of different traffic phases caused by the rarefaction wave and the shock wave under a certain initial vehicle number. A comparison between the upgrade and the downgrade indicates that the value of saturated flux of the downgrade is larger than that of the upgrade under the same condition. This result is in accordance with the real traffic.
Keywords:  generalized optimal speed      car-following model      slope      phase transition  
Received:  12 January 2008      Revised:  09 March 2008      Accepted manuscript online: 
PACS:  89.40.Bb (Land transportation)  
  62.50.-p (High-pressure effects in solids and liquids)  
  64.60.-i (General studies of phase transitions)  
  64.75.-g (Phase equilibria)  
Fund: Project supported by the National Basic Research Program of China (Grant No 2006CB705500), the National Natural Science Foundation of China (Grant Nos 10532060 and 10562001) and the Shanghai Leading Academic Discipline Project, China (Grant No Y0103).

Cite this article: 

Li Xing-Li(李兴莉), Song Tao(宋涛), Kuang Hua(邝华), and Dai Shi-Qiang(戴世强) Phase transition on speed limit traffic with slope 2008 Chin. Phys. B 17 3014

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