Replacing the gas tax with a road user fee would be more equitable and a more stable source of funding for roads

Better fuel economy and steady tax rates mean that by 2015 the federal Highway Trust Fund, the primary source of road financing, will be facing a shortfall. A broad technical consensus on the solution to this problem has emerged: the current gasoline tax should be replaced by a road user fee based on the number of miles driven. Denvil Duncan and John D. Graham accept this policy conclusion. They argue that with the advent of GPS and Internet connectivity in cars, such a scheme is becoming more feasible, and would lead to more efficient travel patterns, and offer a more stable revenue stream for road construction and maintenance.