Also - imagine the horrorshow if there was a "small" fire in an underground tunnel only designed for self driving electric cars. For "safety" - the cars might be forced powered down and doors would be force locked. And if people started breaking their windows to get out - they'd find that there's no walkaway to safety because - of course - they were supposed to stay in their cars.

And - oopsie - there's no way to get firetrucks and fire equipment to the fire. And even firemen on foot might not be able to get to it either. The small fire rages and it gets bigger and bigger and bigger.

People could get BBQed underground.