Dealing with people on freeways is the kind of edge case humans aren’t good at but self driving cars have zero excuses. It’s a common enough situation that someone will exit a vehicle after a collision to make it a very predictable edge case.

Remember all of the bad press Uber got when a pedestrian was struck and killed walking their bike across the middle of a street at night? People are going to be on limited access freeways and these systems need to be able to deal with it. https://www.bbc.com/news/technology-54175359