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

摘要： 提出一种入口匝道与衔接道路交叉口协调控制的策略。采用ALINEA入口匝道控制方法保证主线畅通的前提下，在入口匝道与衔接交叉口均无超长排队时，以入口匝道与衔接信号控制交叉口车均延误最小化为目标；入口匝道无超长排队而衔接交叉口关联相位存在超长排队时，采用衔接交叉口关联相位延长控制策略；在入口匝道存在超长排队而衔接交叉口关联相位无超长排队时，采用衔接交叉口关联相位提前结束控制策略。采用cell transmission model模型构筑入口匝道控制与相衔接交叉口协调控制的模型，实时动态优化地面交叉口的周期跟绿信比。研究结果表明：采用提出的控制方法，衔接交叉口的车均延误虽然有轻微增加，但可以有效防止入口匝道的拥堵蔓延至普通道路，从而可以保证出口匝道衔接区域的畅通，衔接区域的车均延误减少。

关键词: 交通工程, 协调控制, 匝道控制, 城市快速路