水平仪?    A level?

拆迁奖励金?    A reward for demolition of building, grave, factory…etc.?

经纬仪?    A transit?

专用路权?    A Type Right-of-Way?

美国州公路及运输协会?    AASHTO?

自动闭塞系统?    ABS(automatic block system)?

桥台?    Abutment?

出入引道?    Access ramp?

连络道?    Access road?

出入口?    Access?

事故发生?    Accident (Crash) Occurrence?

事故率?    Accident (Crash) Rate?

事故严重性?    Accident (Crash) Severity?

肇事率?    Accident rate?

肇事；事故?    Accident?

易肇事地点?    Accident-prone Location?

精度?    Accuracy?

转向车道?    Added turning lane?

先进大众运输服务?    Advanced Public Transportation Services, APTS?

先进公共运输系统?    Advanced Public Transportation Systems, APTS?

先进交通管理服务?    Advanced Traffic Management Services, ATMS?

全套管基桩?    All casing concrete pile?

全红时段?    All-red Interval?

替代方案?    Alternatives?

铝合金灯箱?    Aluminum signal box?

箭头黄灯?    Amber Arrow?

闪光黄灯?    Amber Flashing?

黄灯?    Amber Light?

锚定?    Anchoring?

公告土地现值?    Announced Land Current Value?

年平均每日交通量?    Annual Average Daily Traffic(AADT)?

年度预算?    Annual budget?

干道?    Arterial road?

干线?    Arterial route?

干道?    Arterial?

沥青混凝土?    Asphalt concrete?

沥青混凝土路?    Asphaltic concrete road?

盲人音响号志?    Audible pedestrian signal?

自动化轻轨捷运?    Automatic Light Rail Transit 简称ALRT?

自动列车剎车系统?    Automatic Train Stop (ATS)?

自动车牌辨识系统?    Automatic Vehicle Identify System?

小型车停车场?    Automobile parking area?