【正文】 . Sustainable transportation: the American experience. Proceedings of seminar C, Planning for sustainability of the 24th European Transport Forum, PTRC Education and Research Services Limited, London, September. [2] Leilei Liu (2020). Promoting Public Transport Development for China Cities. China Academy of Transportation Sciences, Ministry of Communications, December (in Chinese). [3] Li Feng, Shen Jiadong (1999). Economic analyses of urban traffic congestion. Journal of Shanghai Tiedao University, , , (in Chinese). [4] C. Robin Lindsey, Erik T (2020). Verhoef. Traffic congestion and congestion pricing. Tinbergen Institute Discussion paper. [5] Mark Goh (2020). Congestion management and electronic road pricing in Singapore. Journal of Transport Geography, , . [6] Vickerman R (2020). Evaluation the wider economic impacts of congestion charging schemes: The limitations of conventional modeling approaches. The 45th ERSA Congress, Amsterdam, Netherlands. [7] Santos G. B., Shaffer (2020). Preliminary results of the London congestion charging scheme. Public Works, Management and Policy, , , . [8] Chertok M., Voukelatos A., Sheppeard V., etc. (2020). parison of air pollution exposure for five muting 452modes in Sydneycar, train, bus, bicycle and walking. Health Promotion Journal of Australia, , . [9] World Bank (2020). City on the move: a World Bank urban transport strategy review. Washington DC. [10] Air Resources Board (1989). The air pollution transportation linkage, state of California. Sacramento, . [11] Joumard, R (1999). Estimation of Pollutant Emissions from Transportation. Transport Research, Office for Special Publications of the European Communities, Luxembourg. [12] Leon S., Diaz M. I., Mandoza B (1997). Traffic, noise and air pollution in Las Palmas de Gran Canaria: An evaluation of the effects of the ring road. Urban Transport and the Environment for the 21st century III, WIT Press, UK, . [13] Mitchell G (2020). Forecasting environmental equity: air quality responses to road user charging in Leeds, UK. Journal of Environmental Management, , , . 453。 2020 IEEEDOI 449 Traffic congestion, resulting in the increase of travel time, traffic accident, energy consumption and environment deterioration, has produced numerous economic losses. It was reported that economic loss caused by traffic congestion amounted to 40 million Yuan per year in Beijing and 1/3 of GDP in Shanghai in 2020 [2]. In many cites, traffic congestion has seen as a hindrance to economic development. Any sustainable transportation management polices should meet the goals of improving the effects of transport on economic development, and without adversely impacting the environment and the potential for further economic growth. How effective would congestion pricing strategy be in reducing congestion, lowering pollutants and greenhouse gas emissions, cutting fuel use, and reducing other adverse impacts of current transportation system? The basic economic principles of congestion pricing can be illustrated in Figure 1. Theoretically, individual users decide whether or not to use a particular road by weighing the costs they will to bear against the benefits to themselves. Total social benefits can be measure by the area under D in Figure 1. The user costs indicated on the MPC curve reflect only the costs borne by each user as new users (. “marginal” users) are added. However, the marginal user occasions additional social costs, such as air pollution and delay to other users, which he does not bear. The total costs borne by each marginal user and the social costs occasioned by him are the marginal social costs of each trip. Marginal social costs are indicated by the MSC curve in figure 1. Figure 1 Effect of congestion pricing If there are n vehicles in the transport system, and mean user cost is represented by MPC, one marginal user added will increase mean user cost to MPC+△MPC. Thus the marginal social costs can be formulated as [3]: MPCnMPCMPCnMPCMPCMPCnMSCΔ+Δ+=?Δ++= ))(1( The unregulated ‘notoll’ equilibrium occurs at the intersection of MPC and D, resulting in an equilibrium flow of q2 and an equ