“…This is expected to reduce the levels of congestion and emissions of pollutant gases (greenhouse gases and fine particulates). For economists, road pricing is an effective tool ( 26 – 28 ), and several cities, including London, Oslo, Singapore, and Hong Kong have already implemented road pricing schemes, but several other attempts have been abandoned because of strong opposition from users ( 29 ). The acceptability of pricing may depend on how toll revenues are used ( 30 ); however, the acceptability issue is not addressed in this study.…”