Abstract: in order to ensure highway tunnel safety and operation in clear and maintaining a certain level of service, the traffic engineering design and perfect must give enough attention.
摘要：为了确保公路隧道内行车安全、运营畅通和维持一定的服务水平，交通工程的设计与完善必须给予足够的重视。
Interchange is an important part of urban expressway system, whose capacity has immediate influence on the level of service of expressway and the ability of evacuating urban traffic.
互通立交桥是城市快速路系统的重要组成部分，其通行能力直接影响到快速路主线的服务水平以及快速路疏散、分流城市交通的能力。
Once surface street service level is (unacceptable) because of traffic diversion caused by ramp control, either the metering rate will be modified or the (on-ramp) will be closed.
当因交通分流导致地面道路服务水平不可接受时，采取修正调节率或者关闭匝道的措施。
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