关键词: 交通工程, 协调控制, 匝道控制, 城市快速路

Abstract: A coordinated control strategy of urban expressway and traffic signal control is proposed in this article.ALINEA control approach is adopted for ramp study so that expressway is ensured to be unblocked.When overfull queue is inexistence at the on-ramp，the object is to minimize the vehicle average delay on ramp and intersections based on the precondition that expressway is unblocked.When overfull queue is inexistence at the on-ramp and correlative phase of signal control intersection，green extension strategy is adopted.When overfull queue is only inexistence at the on-ramp，red truncation is adopted.Cell transmission model is adopted for signal control surface street，and then the cycle and green time of intersection can be optimized dynamically to maximum the whole benefit of expressway and surface street.The model and the control approach have been illustrated via a simple case study，which shows that coordinated control strategy proposed in this paper can keep from overfull queue at the on-ramp and while vehicle average delay of correlated intersection is still acceptable.

Key words: traffic engineering, coordinated traffic control, ramp control, urban expressway