What is the speed limit in highway tunnels?

[VanFernando]

Highway tunnels have a speed limit of 60 to 80 kilometers per hour. Tunnels are engineering structures embedded within the ground. Here is relevant information about driving in tunnels: 1. Use of lights: When entering a highway tunnel, you should use low beam headlights. If there are no lights inside the tunnel, you should alternately use high and low beams to signal. 2. Laws and regulations: According to Article 58 of the Implementation Regulations of the Road Traffic Safety Law of the People's Republic of China, when driving at night without street lights, poor lighting, or in conditions of low visibility such as fog, rain, snow, dust, or hail, motor vehicles should turn on headlights, position lights, and rear lights. However, when following another vehicle closely in the same direction, high beams should not be used. Motor vehicles driving in foggy conditions should turn on fog lights and hazard warning flashers.