Traffic wave

About: Traffic wave is a research topic. Over the lifetime, 2106 publications have been published within this topic receiving 62117 citations. The topic is also known as: phantom traffic jam & ghost jams.

Study on the traffic behavior of on-ramp system with two-lane main road under signal controlling

Abstract: In this paper we investigate the two-lane main road on-ramp system with signal-controlling using the cellular automata traffic flow model. The traffic signal is setup at the merging part between the main road and the on-ramp so that it can control the vehicles of both roads. We simulate the effect of traffic signal on vehicle flows of main road and on-ramp, and the traffic capacity and average velocity at the merging part are discussed. Through the analysis of the phase diagram, it can be found that the on-ramp system with two-lane main road can embody more complicated and realistic traffic flow characteristics than the on-ramp system with single-lane main road. Compared with the model introduced by Jiang Rui ［Jiang R 2003 J. Phys. A 36 11713］, the simulation results indicate that the state of traffic flow is improved obviously and the capacity of the on ramp system has increased.

Improving Urban Traffic by Velocity Guidance

Abstract: In this paper, we use CA model to study the traffic flow on a ring road with one traffic light. A velocity guidance strategy is presented: when crossing traffic light, a message will give the driver a desired velocity in order that he can avoid sharply brakes when signal light turns red. The numerical results show that the velocity guidance strategy can efficiently reduce the ratio of the stopped vehicles and get relatively high and stable flow.

Incidents and Intervention on Freeways

Abstract: This paper focuses on the spatio-temporal aspects of congestion caused by an incident and the way in which this can be alleviated by a traffic management intervention. A kinematic wave model of traffic is applied to investigate the issues of congestion. Expressions are derived in closed form for a number of quantities of interest including the maximum extent of the region, the time at which that occurs, relevant times for an intervention, and the effects of that on the size of the congested region. Special forms of these expressions are established for the case of the linear speed-density relationship and calculations are performed to illustrate the application of the resulting analysis to examples of incidents both with and without intervention.

Intelligent traffic control central system of Beijing-SCOOT

Abstract: As the demand of traffic is increase, Smooth traffic stream has become chaos, even crowded in a certain extent, it affect the traffic safety of Beijing and the operation efficiency of the road in great degrees. SCOOT system is a real-time Adaptive Traffic Control System, It constantly collecting traffic data of the controlled road-network, According to the changing traffic demands, it will optimize and adjust all the related junctions in the whole road-network and the signal time configuration of the crosswalk frequent and in small extent, and control the signals of the junctions, modulate the travel of the traffic, strive for give the green signals when a large number of vehicles arrived at the junction, thereby reducing the total traffic delay of the whole controlled area, increase the traffic capability of road-network. The application of SCOOT system in central of Beijing shows that it is a suit of real-time Adaptive Intelligent Traffic Control System, which actualized very well.