Although the straight-line distance between Dalian and Yantai is only150km, the two cities have been unable to cross the bridge due to the barrier of Bohai Sea. There are many large ports around Bohai Sea, such as Tianjin Port, Qinhuangdao Port and Tangshan Port. If a bridge is built at sea, once a large cargo ship hits the pier during the voyage, the loss will be extremely huge. Therefore, the Dalian-Yantai Bridge has not yet been built.