Yuanjiang Tunnel has a height limit of 4.5m and a speed limit of 60km/h.. Pedestrians, non-motor vehicles, motorcycles, dangerous vehicles, freight vehicles and public transport vehicles are prohibited from passing. When driving in a tunnel, vehicles must keep a safe speed and distance. It is forbidden to change lanes and stop at will, and it is forbidden to overtake, reverse, turn around and go backwards.
Matters needing attention in tunnel excavation
You must slow down properly before entering the tunnel. There are usually obvious speed limit signs at the entrance of the tunnel to remind drivers to slow down before entering the tunnel. The lane in the tunnel is usually narrower than that outside the tunnel, so slowing down helps the driver to accurately grasp the road conditions.
Turn on the low beam at the same time. Due to the dim light in the tunnel, the driver's eyes will be temporarily blind. At this time, you need to turn on the low beam, which will not only let the driver see the road ahead, but also let other vehicles notice your presence. It should be noted that driving in the tunnel is prohibited to use high beam, which is extremely dangerous.