Traffic Controller Design and Management for Freeway Systems
Traffic flow instabilities such as traffic congestion are often caused by inappropriate speeds and headways that drivers choose when they operate their vehicles. Thus traffic speeds and headways inhomogeneity appear in the freeway system, which decrease the total systems efficiency. It is expected that the congestion could be reduced and traffic flow rate could be increased, if the speed and density of the vehicles along a lane can be properly controlled by a controller. In this paper we propose a density controller under the assumption that all vehicles drives instantly follow the information issued by the controller. Then we control and manage the traffic through the following method: on the macroscopic level, a density controller calculates the desired speed commands to be followed by vehicles in each section of the freeway lanes in order to achieve desired traffic density distributions that lead to optimum traffic flow conditions; on the microscopic level, each vehicle is driven according to the appropriate commands sent by the density controller. And the same time we investigate the benefits of controlling the density and speed of the vehicles along a lane by using the proposed density controller. The simulation results guarantee exponential convergence of the traffic density at each section to the desired density and demonstrate significant benefits in terms of smooth and stable traffic flow that reduce congestion considerably.
Freeway Systems Density Controller Optimal Design
Liang Chao Xie Jinsong Fan Bingquan
School of Management, University of Shanghai for Science &Technology, Shanghai, P.R.China,200093
国际会议
郑州
英文
2008-09-20（万方平台首次上网日期，不代表论文的发表时间）