城市门路宽度(国外英文资料).docVIP

城市道路宽度(国外英文资料) ????? According to the regulations of the urban road traffic planning design (gb50220-95), urban roads are divided into urban express roads, main roads, secondary highways and sub-branches. (1) the urban expressway ??????????? The urban express and main roads are the main traffic routes of the city, which connects the various sub-regions of the city and carries a large number of passenger and freight traffic. The main function of the expressway is to provide transit service for motor vehicles. Their typical features are wider cross-sections and strict separation of non-motor vehicles and pedestrians. In traffic planning and traffic management, and strive to improve motor vehicle traffic capacity, to ensure the motor vehicle traffic capacity, try to avoid a non-motor vehicle, pedestrian traffic disruption of motor vehicle traffic. The characteristics of the expressway are: ????????? The design standard is the highest in the city road, the width of the road is 40 to 60 meters. ????????? There are more lanes and more traffic. ????????? Calculating the speed of the bus is much higher than that of other cities, usually 80km/h. ????????? 4. Cross-sectional form generally is more complicated, the central space, main and side roads, motor vehicles, non-motor vehicles driveway space facilities, some will be designed to be elevated in the main form; ????????? The roads are equipped with complete facilities for drainage, lighting and monitoring facilities. ????????? The traffic jam is small, usually in a fully enclosed form, which prohibits non-motor vehicles and pedestrians from entering. ??????????? The city express road is mainly in the big cities, such as the two rings in Beijing, three rings, four rings, and Shanghai yanan elevated road. (2) the main road ??????????? The main road is the design specification, and the speed is lower than the urban freeway. It is the backbone of the urban road system, connecting the cities and connecting them to the citys ra