What is the speed limit on the Ya'an-Xichang Expressway?
1 Answers
The Ya'an-Xichang Expressway implements three types of speed limits based on lane, vehicle type, road section, and season. Here is the detailed introduction: 1. Lane-based speed limits: The expressway is divided into a left lane for small passenger vehicles and a right lane for passenger and freight vehicles. On general sections, the speed limit for the small passenger vehicle lane is 120-100 km/h, and for the passenger and freight vehicle lane, it is 100-60 km/h. Starting from the initial slope section, the speed limit for the small passenger vehicle lane is 110-90 km/h, and for the passenger and freight vehicle lane, it is 90-60 km/h. 2. Section-based speed limits: Key control sections such as tunnels and long downhill slopes on the Ya'an-Xichang Expressway have specific speed limits. For tunnels, the speed limit is 70 km/h; for long downhill slopes exceeding 3 km, the speed limit for the small passenger vehicle lane is 90-70 km/h, and for the passenger and freight vehicle lane, it is 80-60 km/h. 3. Seasonal speed limits: Based on the actual conditions of snow and ice accumulation from November to March each year on sections like the northern slope of Daxiangling Nibashan and the northern slope of Tuowushan, the speed limits are appropriately adjusted, and temporary traffic control measures such as guidance, restricted access, or prohibition are implemented for vehicles.
