安全设施?    Safety devices?

取样?    Sampling?

砂土，砂?    Sand?

定时号志控制?    Scheduled Signal Control?

客座公里?    Seat-Kilometer?

沉砂池?    Sediment tank?

服务器?    Server?

服务区?    Service Area?

服务流率?    Service Flow Rate?

行车频率?    Service Frequency?

服务道路?    Service road?

服务流量?    Service volume?

沉陷?    Settlement?

简讯服务?    Short Message Service（简称 SMS）?

短期运输规划?    Short-term Transportation Planning?

路肩?    Shoulder?

国际标准单位?    SI units?

边沟?    Side Ditch?

边坡?    Sideslope?

人行道?    Sidewalk?

筛?    Sieve?

视距?    Sight Distance?

标志?    Sign?

灯号转换时段?    Signal Change Interval?

号志分相?    Signal Phase?

号志时制计划?    Signal Timing Plans?

基地开发?    Site Development?

梳子坝?    Slit dam?

斜角?    Slope angles?

斜距?    Slope distance?

坡度?    Slope parameter?

边坡稳定分析?    Slope stability analysis?

坡?    Slope?

慢车道?    Slow traffic lane?

慢车道专用号志?    Slow traffic lanes signal only?

小客车?    small Passenger Vehicle?

小型汽车?    Small vehicle?

智慧卡?    Smart Card?

水土保持?    Soil and water conservation?

车位小时?    Space Hour?

特种车?    Specially Constructed Vehicle?

公路路线设计规范?    Specification of the highway route design?