Minnesota's Interstate 394 is becoming the latest U.S. highway to give solo drivers access to its often-empty high occupancy vehicle, or HOV lanes, for a fee, which is paid electronically. The high occupancy toll (HOT) lanes, also referred to as "dynamic" toll lanes, are gaining popularity in some cities, allowing drivers stuck in traffic to hop into fast-moving HOV lanes at a cost that varies according to how heavy traffic is.

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