The Joint Control of Variable Speed and On-Ramp Metering for Urban Expressway

SYSTEMS ENGINEERING1. INTroDUCTIONThe urban expressway is a type of road facility on which vehicle can run at high speed. In recent years s thefacility is emerging in many metropolises throughout China such as Beijing, Shanghai and Tianjin. The urbanexpressway may be defined as a divided road facility with full control of access and two or more lanes for theexclusive use of traffic in each direction.However, the expressway was usually built at suburb, this may result in much acces…

The Joint Control of Variable Speed and On-Ramp Metering for Urban Expressway

The traffic performance of urban expressway is subject to non-recurring and recurring events, which may cause heavy congestion and vehicles long queuing on ramps. The low performance may bring more traffic delay to the whole network of urban road. This paper presents a new method, the joint control of variable speed control and on-ramp metering, which attempts to improve the level of traffic operations on urban expressway. By analyzing traffic flow on urban expressway, an optimum control strategy of variable speed and on-ramp metering is established in the paper.