"The federal Highway Trust Fund now apportions about 81 percent toward roads and bridges and 19 percent to mass transit. Some lawmakers and transit advocates are mounting a significant campaign to level the funding distribution, which has highway supporters warning that such a funding shift could upset sensitive plans - including a possible increase in the federal gasoline tax - to boost trust fund receipts.
The revenue from gasoline and other motor fuel taxes has not kept pace with transportation spending, as vehicles become more fuel-efficient and the recession has reduced some highway travel. It is largely accepted that without a tax increase transportation projects will be dramatically cut back. Most transportation groups support raising the gasoline tax."