
Haicang Tunnel has a total length of 7.1 kilometers, with the tunnel section measuring 6.28 kilometers. It was constructed according to Class I highway standards, featuring a two-way six-lane main route. The speed limits for Haicang Tunnel are as follows: 1. Small vehicles: speed limit of 90km/h. 2. Large vehicles: speed limit of 80km/h. Relevant information about speed limits: 1. Speed limitation: Some vehicles have their maximum speed limited for safety considerations. For example, premium sedans and sports cars from German brands like , BMW, and Audi have their top speeds capped at 250km/h. 2. Speed limit standards: The speed limit for Class I highways can be set between 60-100km/h depending on specific circumstances; for Class II highways it's 40-80km/h. Therefore, setting the speed limit at 60km/h has policy basis.


