It helps set the stage to advance their green agenda
...report that supported the idea of taxing drivers based on miles driven.
Among other things, CBO suggested that a vehicle miles traveled (VMT) tax could be tracked by installing electronic equipment on each car to determine how many miles were driven; payment could take place electronically at filling stations. The CBO report was requested by Senate Budget Committee Chairman Kent Conrad (D-N.D.), who has proposed taxing cars by the mile as a way to increase federal highway revenues.