perations. Congestion pricing implementation in Singapore has showed that traffic volumes decreased by17% in peak time periods, and London ’s experience also indicated that pricing schemes was essful. As we convert all the savings in travel time resulting from decreased congestion to ary units, we can conclude that the reduction of congestion will promote sustainable economic development. Toll will affect travelers ’ budget constraints and will result not only in mode switching but also in broader changes in the economy that will be panied by the geographic redistribution of trips. Some concerns that congestion pricing may have negative effects on the economy of the central area, particularly on retail .A counterargument, however, states that the reduced congestion is supposed to lower the
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