跟车时间百分比（延误率）是衡量双车道公路服务水平的一个重要指标。
Percent Time-Spent-Following (Percent Time Delay) is an important index to estimate Level-of-Service of tow-lane highways.
公路服务用户满意度模型是评价公路服务质量、提高公路服务水平的重要工具。
Customer satisfaction model of highway service is a very important tool to evaluate and improve service quality of highway sector.
高速公路交通安全设施系统在保障高速公路安全行车，提高公路服务水平等方面具有重要作用。
Freeway traffic safety facilities system has vital function on the aspect of ensure freeway safe-running of vehicles, improving highway service level and so on.
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