ezbee:

 

Arbitrary fuel vehicle bans.

 

To be fair, it is an area where Adam Smiths 'hidden hand' can work.
The arbitrary ban is well very 'arbitrary'. Turns people contrarian.

 

You could apply all the same arguments to banning leaded petrol, or CFCs. And yet ... once the ban came info effect, it turned out that actually the world didn't end after all. Most of the very few vehicles that experienced significant knocking on unleaded petrol were tunable to fix it, and those that weren't were hardly lamented. There were plenty of other chemicals that we could use for refrigerants and propellants, so the switch to those was practically invisible.

As another poster said, if you want to be contrarian and still drive your old smoke-blower in 2030 nobody will stop you any more than they stop you driving a Model-T today. It will simply be a case of 99.99999% of drivers just won't, because hearing the engine go "brrrrrr" isn't worth the effort or expense. It might be fun to try it once, just for the experience, but you'll be glad you don't have to do it every day.

For the true special cases - and we're talking about 7 years from now - there will be exceptions. But they will be special cases. We already have solutions for the vast majority of use cases right now.