If done right it may even work against humans.

I think this is under-discussed. People bring up how self-driving cars can't deal with unwinnable situations, like crashing into a school bus vs. an old lady. Why is this scenario considered novel? Human drivers cannot avoid these either.

Because it hasent happened? The roadrunner gag comes up every few years only to be debunked (by snopes and others). Computer vision is fooled by many things that are still very obvious to the human observer.

It's sort of been tried https://artofgears.com/2015/12/16/did-a-fiat-crash-into-a-pa...

A problem I think is the visual appearance of a tunnel changes as you move in relationship to in in a way that a static image would not.

I think that's what the radar is for.

The radar can't see stationary obstacles. Autopilot has already killed people because of that.

What if a bridge is drawn over the tunnel?

With multiple cameras it is possible to have depth perception, although I imagine that can be difficult if the tunnel is just a black blob