What is the highest speed in expressway?

On roads without speed limit signs and markings, the maximum speed is 40km/h, while in expressway, where there is only one motor vehicle lane in the same direction, it is 70km. There are three main speed limits in expressway: 1. Sign speed limit: refers to the speed limit signs and markings clearly set on the expressway. Usually, these speed limit values are comprehensively determined by the transportation department according to the design speed of the highway, the functional type of the highway, the geometric linear characteristics, the operating traffic flow, the roadside environment and other factors. 2. Legal speed limit: refers to the road section without direct speed limit sign. Usually, drivers should abide by the speed limit stipulated by relevant laws and regulations. The maximum speed of urban roads marked with infinite speed signs shall not exceed 70km \u002F hours, and the maximum speed of rural roads shall not exceed 60km \u002F hours. 3. Speed limit in special time and weather: Generally, when the visibility of fog, rain, snow, dust and hail is less than 50m on ordinary roads, and when driving on icy and muddy roads, the speed limit is 30km per hour.