The Illinois Department of Transportation is ready to build many more lanes and flyovers at the Circle Interchange, shown here in a postcard from 1963. Posted by Brandon Bartoszek.  Because of vehicles with higher fuel efficiency, slightly less driving, and the gas tax not being changed since 1993, the motor vehicle fuel tax, or "gas tax", has failed to pay for everything that Congress has legislated that it should pay for. The Highway Trust Fund, which includes the Mass Transit Account, has received several infusions of money from the "general revenue fund" – to the tune of over $60 billion. But a new report from the Government Accountability Office, the congressional think tank focused on financing, past, present, and future, has made the country take a giant step forward in considering a switch to a fee that more accurately charges usage. The report, like all GAO studies, was commissioned by the House Transportation Appropriations Subcommittee*. The gas tax charges drivers based on their u More