Whenever a long queue is detected at the metered ramp, the signaltiming should be adjusted to reduce the traffic flows entering the ramp. 当管匝道上排队较长时，系统将通过自动调整来减少进入匝道的车流量，以保证匝道控制系统的有效性，避免匝道排队过长，减少高速公路瘫痪的可能性。
The decomposition and coordination methods applied to large system design are used for coordinated ramp metering on freeways. 摘要采用大系统分解和协调的方法研究高速公路多匝道的协调控制问题。
