【正文】 status). That is equal access to a clean environment and equal protection from possible environmental harm irrespective of ine, class or other differentiating feature of socioeconomics status [13]. Transportation planners should point out that the reduction of congestion levels and increased trip speed on an entire facility will benefit users of public transit. It will important to explain to the public that congestion pricing represents a step towards a more equitable method of paying for transportation systems. Existing transportation improvement programs are paid for by gasoline tax. Congestion pricing requires those choosing travel in peak time period to pay significantly more than those choosing travel in any other time periods. Congestion pricing also reduces inequity in exposure to NO2 with the extent of the reduction congestion areas according to the charge option. In other words, the NO2 inequity reduces linearly with improvements in citywide air quality and with reduction in total distance traveled on the road work. From an environmental equity perspective, the effectiveness of congestion pricing is sensitive to the spatial distribution of socioeconomic characteristics。Congestion Pricing and Sustainable Development of Urban Transportation system Jianhu Zheng (Department of Automobile Engineering, Minjiang University, Fuzhou, Fujian, 350108, China) Abstract The rapid growth in urbanization and motorization generally contributes to an urban transportation system that is economically, environmentally and socially unsustainable. The result has been a relentless increase in traffic congestion. Road congestion pricing has been proposed many times as an economic measure to fight congestion in urban traffic, but has not seen widespread use in practice because of Some potential impacts of road pricing remain unknown. The paper first reviews the concept of sustainable transportation system, which should meet the goals of economic development, environmental protection and social justice collectively. And then, based on the characteristics of sustainable transportation system, how congestion pricing can contribute to economic growth, environmental protection and social justice is examined. Examination result shows that congestion pricing is a powerful way to promote the sustainable development of urban transportation system. 1. Introduction Urban transportation is a pressing concern in mega cities around the world. Along with China’s rapid development of urbanization and motorization, traffic jams has bee a more and more serious problem, resulting in greater time delay, increase of energy consumption and air pollution, decrease of reliability of road work. In many cities traffic congestion is seen as a hindrance to economic development. Numerous methods can be used to address congestion and reduce transport density, including building new infrastructure, improving maintenance and operation of infrastructure, and using the existing infrastructure more efficiently through demand management strategies, including pricing mechanisms. Congestion pricing has long been proposed as an effective measure to bat traffic congestion. The principle objective of congestion pricing is to alleviate congestion by implementing surcharge for the use selected congested facilities during peak time periods. By shifting some trips to offpeak periods, to routes away from congested facilities, or to higheroccupancy vehicles, or by discouraging some trips altogether, congestion pricing schemes would result in savings in time and operating costs, improvements in air quality, reductions in energy consumption and improvements in transit productivity. There are lots of successful applications in some countries and regions in the rest of the world. Following Singapore in the early 1970s and Norwegian toll rings in the mid1980s, the city of London introduced its area toll in February 2020。 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 congestio