Charging drivers a premium to enter a city center during peak hours has improved air quality and reduced traffic gridlock in urban pockets around the world. Rising gas prices and an ailing transit authority might revive the chances that congestion pricing could benefit a U.S. city.
This year Singapore began a flat-rate charge of S$3 to cars driving into the business district during morning rush hour:
1975
Increase of average traffic speed since this congestion pricing went into effect:
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