Before anything else I want you to stop with the environmental shtick. Yes I have knowledge that vehicle exhaust contributes to climate change. I'm a little wary on calling it global warming because I find climate change to be more accurate. The exhaust from cars and other sources keeps more energy within our system and that energy changes our climate from a previous norm. Don't ever bring this up again because while that's important a state also needs to fund for roads; not just maintenance but also new infrastructure. The gas tax didn't do it, and raising it may not bring in the revenue needed to fund new project. I don't know where VA sits but I know Maryland's gas tax barely pays just for maintenance and they cannot get new funds for projects even with a gas tax increase.
The reason you would use the SUT is simple: You'll gain
more revenues through an increase in the SUT than you would through the gas tax. You would have to raise the gas tax a lot to meet the same increase through the SUT. The gas tax won't raise as much as you grow than the SUT unless you raise it a lot. And if you raised the gas tax more you will probably see a few things happen. People will use gas less (this is what you want) and it will cost more disproportionately to people who need to use more gas (we're assuming most vehicle use isn't recreational). If less gas is used then that's less tax revenues so you again run into the same problem you had before you increased the gas tax. You can increase it again which again effects those who use gas more disproportionately but overall you're not going to get the revenues that the SUT would especially if the state's economy grows.
Maybe, just maybe VA either hit that limit or realizes they may which is why they folded it into the SUT. There is no argument against this as far as increasing revenue for transportation, it's going to work better than a gas tax that you keep increasing.
However you are correct that removing the state gas tax (again people will still pay the federal gas tax which does NOT go towards the state's infrastructure so again and diesel still pays the state gas tax) may reduce the manufacturing and habit externalities. That's because the gas tax has an effect on usage; if gas costs too much people find ways to use less or none at all. This is good for the environment because as I mentioned at the top exhaust contributes to climate change.
However between raising revenues for transportation to service the state by the SUT increase or by the gas tax increase the clear winner is the SUT increase. There is no argument on this. You'll lose some of the externality effect.
So if you want the externality back you can either go back to a gas tax increase which won't provide the revenues you need in favor of the externality effect or maybe blend the two: VA made their choice. If it means anything I just emailed them about it and maybe I'll get a response.
The value of the externality in this gas tax I cannot assess myself. Because there are probably more factors than just the state gas tax I don't know how much it will slow the momentum of a shift to alternative fuel cars and higher efficiency engines.
I don't think I've missed anything in my response and I want to make sure I didn't because I don't want to give you the opportunity to have a reason to ignore the purpose of the transportation revenue reform. If you want your gas tax with a logos of curbing use, then go make that law. The gas tax originally want meant to be used for transportation revenue not for curbing use. The revenue would go to projects such as light rail and public transport all of which also curb gasoline use; the same externality you want which you're going to get IF you are able to generate the revenues and the gas tax (even an increase) won't be as effective at generating that revenue. Basically don't hold your transportation revenue hostage with the externality. That bulletwound in the foot's going to bleed a lot. Now I'm sure you'll say something witty like "not as much as when <insert environmental effect here> does" but again I'd say handle it with another law: break the tie on the transportation revenue and go make
your law
ETA: Oh forgot this:
turtles said:
I could reanalyze the gas tax to increase it. Apparently the state tried to impose regional authorities to impose taxes and fees (and earlier idea I mentioned) however that was struck down as unconstitutional in 2008 so you can't do that.
I mentioned
earlier in the thread how generating revenues by use could be done so that the higher road users (not necessarily gas users but it should probably run together) would be taxed more. VA tried to initiate a plan to make these agencies that would do that however it got struck down as unconstitutional.