Abstract: Ramp metering first installed in Chicago in 1960s is now widely employed in North America and European countries to release motorway traffic congestion and incidents. This paper reports case study results of a ramp metering system (using ALINEA control strategy )in Southampton, UK.
The detailed survey data recealed the potential impacts of a ramp metering system to merge traffic, to mainline motorway traffic,particularly those in pre-merge area of mainline motorway lane 1. Based on the case study, it is believed that ramp metering does improve merging condition of traffic from slip road, but may also cause minor reduction of flow and speed of mainline motorway traffic up and down stream of the metered junction during the metering time.

Key words: ramp metering, case study, motorway

摘要： 高速公路入口控制最早于1996年出现在芝加哥市，现在北美及欧洲等国家广泛采用它来缓解高速公路交通拥挤状况。此论文研究了南安普敦市高速公路入口控制方案的案例（采用ALINEA）控制策略。研究的详细数据表明：高速公路入口控制系统对辅路上的车流、高速公路主干线上的车流、尤其是对高速公路第一车道入口汇合前的区域存在潜在影响。基于此案例研制高速公路的主干道的车流量和速度的轻微减小。

关键词: 入口控制, 案例研究, 高速公路