A year ago when the price of gasoline reached $4 a gallon, motorists reacted by staying off the highways. Today a gallon of gas costs little more than half that record figure, but tax revenue figures show drivers have not gone back to their old habits.

The result is a sharp revenue decline in the state’s motor license fund, which is projected to be $150 million less than the $2.6 billion estimated for the year ending June 30, Rich Kirkpatrick, PennDOT spokesman, said.

“People are driving less,” he said. “Tax collections are well below estimates for the entire fiscal year,” he said.

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