It is hard to even recognize it. On the road it looks exactly like a crack. For a case of a low hanging one - it is invisible by LIDAR or radar, on the camera the difference between a regular one and a low hanging one is very subtle.

And the requirement is not just braking action, like with a railroad crossing it is active avoidance.

https://www.pge.com/en_US/safety/electrical-safety/what-to-d...

My point is - corner cases like these tend to create "IF" statements in a "pure physics model" that is used for decision making under uncertainty. And engineering such models without "ML fad" is difficult.