"Most transportation experts think the gas tax is not only on its last legs, but should be replaced by some kind of electronically monitored system measuring how many miles a car is actually driven. But the idea likely needs lots of testing and the White House, in a recession economy, is opposed.
So what do we get? A series of short-term program extensions, forcing Congress to make up for declining gas tax proceeds with general revenue funds–i.e, deficit spending. In the process most dollars are left flowing through traditional transportation "stovepipes" that are tilted heavily to roads over transit, traffic "throughput" over community livability."