Using Underground Logistics System to Mitigate the Congestion of Urban Transportation Network

Underground logistics system can effectively solve the problem of urban traffic congestion and environmental pollution. Underground logistics system plays an essential role in road network, and the road network is the main transport mode of city logistics. Goods demand between logistics parks affects the city traffic. Meanwhile, urban traffic development promotes the city logistics prosper. Analyzing the effects of underground logistics system on road network is the premise to build the underground logistics system and optimize traffic network. By comparing whether or not established underground logistics system on road network, this paper calculated three indexes including logistics volume, network efficiency and negative effect under the condition of traffic equilibrium with fixed demand to validate the superiority of underground logistics system. Simulation results show that compared with road network without underground logistics system, the road network contained with underground logistics system can greatly improve the network efficiency, reduce ground logistics volume and total logistics disutility, and optimize the transportation network structure to response the variations in logistics demand with emergency at the same time.