Motorists' habits spur call for tax increases

Charles Whittington, chairman of the American Trucking Associations, which supports a fuel tax increase as long as the money goes to highway projects, said Congress may decide to disguise a fuel tax hike as a surcharge to combat climate change.

Transportation is responsible for about a third of all U.S. carbon emissions created by burning fossil fuels. Traffic congestion wastes an estimated 2.9 billion gallons of fuel a year. Less congestion would reduce greenhouse gases and dependence on foreign oil.

"Instead of calling it a gas tax, call it a carbon tax," Whittington said.

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