It could be interesting to artificially constrain the number of cars and auction the slots on a rolling 12 Month basis so that the tax payers get the full value of the licenses rather than speculators
Why?
Also, if we're doing this, let's also artificially constrain something else, maybe the amount of meat produced, and auction the right to sell meat to few highest bidders? After all, meat production has a lot externalities like methane emissions, etc etc., so why not constrain it?
Then, we must prevent exploitation of poor underpaid workers in Bangladesh, so let's restrict clothes supply, to reduce harmful externalities. Two pairs of basic jeans and 3 shirts should be enough for everyone, right?