The plan is a part of the administration's Transportation Opportunities Act, an undated draft of which was obtained this week by Transportation Weekly.
The White House, however, said the bill is only an early draft that was not formally circulated withn the administration.
“This is not an administration proposal," White House spokeswoman Jennifer Psaki said. "This is not a bill supported by the administration. This was an early working draft proposal that was never formally circulated within the administration, does not taken into account the advice of the president’s senior advisers, economic team or Cabinet officials, and does not represent the views of the president.” 
News of the draft follows a March Congressional Budget Office 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.
Obama's proposal seems to follow up on that idea in section 2218 of the draft bill. That section would create, within the Federal Highway Administration, a Surface Transportation Revenue Alternatives Office. It would be tasked with creating a "study framework that defines the functionality of a mileage-based user fee system and other systems." Read more from Pete Kasperowicz, The Hill
