Not on the interstate, but in certain parts of the country, the Amish would beg to differ with you about whether or not horse and buggies can share the road.
The clunker rebates had a short term effect in the actual supply of used cars, hence used car prices went up, and never quite came back down again. Manufacturers scaled up their factories, to pick up the slack to sell newer, more fuel efficient (and usually smaller) cars in their place. For a while, in the Midwest, if you were looking for a 3 row used car to haul your family around, good luck with that, you would end up paying top dollar, even for a used pos.
Fast forward to more recent times and dieselgate. Took a lot of VWs off of the roads. However, because of the scandal, VW hasn’t been doing too well in America as their own brand, but, perhaps better under their other brands like Audi or Porsche.
Until reading the recent article about demo derbies, never understood the appeal.
Now, I think about the tremendous waste all of those cash-for-clunkers and VW Dieselgate cars could have been participants in that kind of thing…