Research on ramp optimization metering strategy in urban expressway

Abstract

Taking Beijing urban expressway as research object, the control strategy with the measure of ramp metering is sought to deal with traffic congestion. The ramp metering methods, i.e. the local ramp optimization metering and the congestion dissipation control on urban expressway are put forward. The control strategy is not only to alleviate traffic congestion situation on mainline of urban expressway, but also to avoid the block of the surface streets owing to the serious queue. The examples denote that the methods are feasible and can offer reference for the theory of ramp control, and can be applied to engineering practices.

Study on Interval Optimal Control Method for Ramp’s Merging Areas in Urban Expressway

“…However, according to the study we found that traffic jam phenomenon in the large, heavily intertwined ramp is significant. On account of the characteristics of traffic flow, Chen put forward the ramp control method based on time occupancy and velocity as control variables [1]. Actually, the traffic volume, speed and time occupancy of the same road section are interval numbers.…”

“…Actually, the traffic volume, speed and time occupancy of the same road section are interval numbers. Therefore, we propose the interval optimal control model of ramp based on reference [1], and use a single dynamic adjustment algorithm of on-ramp to give the control scheme.…”