Here's some news for you, drivers changing lanes without looking happens thousands of times a day. A friend of mine had that happen with a 18 wheeler. His car was wrecked and they tested the driver for alcohol. He wasn't drunk, maybe he was tired. Either way, he changed lanes without looking and my friend is lucky he survived.
Any autonomous vehicle needs to handle this, otherwise people will die as they do now when careless drivers make mistakes. It's going to take a decade or more before all vehicles on the freeway are autonomous, which it should be. AI is useful, but we need to tackle the whole problem holistically. Cars have to change, policy has to change, culture has to change and people have to change.