traffic engineering The determination of the required capacity and layout of highway and street facilities that can safely and economically serve vehicular movement between given points(对道路和街道设施所需容量和布局的决定，以便安全和经济地服务于给定两点间的车辆运行。)
road traffic engineering Discipline which includes the design of highways and pedestrian ways, the study and application of traffic statistics, and the environmental aspects of the transportation of goods and people(一门学科，包括设计高速公路和人行道，交通统计的研究和应用，以及运输物品和人的环境状况。)
