The Senate Environment and Public Works Committee's approval of the six-year surface transportation measure follows House approval of its version of its competing version last week.
Lawmakers failed to come to terms last year with the White House for a funding level on the highway bill that Congress had hoped to fund at a higher level that the Bush administration has supported.
Republicans and Democrats on the panel, including Chairman James Inhofe, R-Okla., indicated they would work to increase the funding level on the Senate floor beyond the White House's $284 billion threshold.
Beyond the potential funding difference, a particularly contentious provision in the House measure remains unresolved: how much money states should get back in federal gasoline taxes that fund the measure.
A provision to the measure during House floor debate guarantees around $11 billion in projects wanted by individual members in an effort to squelch dissent over the issue.
House members from so-called donor-states, such as California and Texas -- which get back less money than they pay in federal gas taxes -- have been pushing for an increase in the current 90.5% return rate.