It's cute that you think that matters in this Administration, where the right hand very often doesn't know what the left hand is doing, or that the boss cares about anything other than who gives him gold-plated Towelie cum-rags as gifts.
...and by vehicle weight - to raise funds to maintain the roads. And then they should keep the fuel tax, to capture the economic costs of carbon pollution. And we should do the same, here in the US.