Via Governing.com

Transit agencies and companies have tried raising toll prices at peak times, but even that's not keeping drivers away, so they're looking for new ways to reduce congestion.

The idea behind high-occupancy toll lanes is pretty simple: Carpoolers ride free, but single riders pay a toll rate set by the principles of supply and demand. The more crowded the lane becomes, the more expensive the toll.

Tolls that automatically adjust to traffic do help pay for the roads they are on, but their main purpose is to reduce congestion on highways, said Neil Gray, director of governmental affairs for the International Bridge, Tunnel and Turnpike Association, an industry group.

But now many of the companies and agencies that run toll roads are discovering that even high prices sometimes aren’t enough to keep traffic flowing as fast as they would like.

In many cases, they’re looking for new ways to satisfy demand, or even drive it down, without building even more lanes.

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