I don't know how "unnecessary" it is if we're talking snowed roads, country roads, roads that haven't been painted in a decade or longer, or if we're talking about autonomous cars without a wheel.
Under those conditions, it's pretty much Level 5 or bust. But yes, that doesn't mean Level 4 cars won't start getting adopted, especially if the autonomous systems are just another "feature" on a regular car (hopefully EVs in all or most cases).
Under those conditions, it's pretty much Level 5 or bust. But yes, that doesn't mean Level 4 cars won't start getting adopted, especially if the autonomous systems are just another "feature" on a regular car (hopefully EVs in all or most cases).