https://www.techradar.com/news/new-uber-patent-shows-how-self-driving-cars-might-talk-to-pedestrians

Working out the intentions of other human drivers usually isn't too difficult – and most people will vociferously let you know if you go wrong – but what happens with self-driving cars? When there's a robot behind the wheel, it's not quite as simple to work out which direction a vehicle's going to turn next.

Uber thinks it might have an answer, as per a recently filed patent: flashing lights and signs on the outside of self-driving cars that tell pedestrians exactly what's happening. One image shows a "please proceed to cross" sign on the front grill.