Tolls varying by time of day are collected at highway speeds using electronic toll-collection technology. Vehicles are equipped with transponder tags which are read by overhead antennas.
One such system located in Orange County, California saved commuters on the priced express lanes up to an hour each day along State Route-91.
Expanded to other metropolitan freeways, congestion pricing is expected to save the average commuter along a 5-mile freeway segment up to a half hour each day.
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