The main purpose of “Suhua Highway Improvement Project” is to solve the long-term problems of poor road alignment, easy to be snapped by landslides, and higher accident rate on three sections of Suhua Highway, including Su’ao to Dong’ao, Nan’ao to Heping, and Heping to Dachingshui. In consideration of the maintenance of environment and ecology as well as the reduction of impact on the local area after opening it to the public, the purpose of Suhua Highway Improvement Project is not for mass transportation. That is why it is designed with only one lane to maintain existing road capacity.
Due to the rural location, we also consider the demand of rescue in the shortest time if there is any emergency in the tunnel. Thus, emergency rescue paths are established in Dong’ao Tunnel, Guanyin Tunnel, Gufeng Tunnel, and Zhongren Tunnel in order to allow disaster-rescue vehicles, like police cars, fire engines, and ambulances, access to the tunnel as soon as possible.