It would be nice if autonomous cars could emit a "yielding to pedestrian" light. I suppose it could be an addressable strip around the whole vehicle where only the section closest to the ped actually illuminates, so the ped can know that the car sees them specifically. The equivalent of eye contact with a wave. Otherwise, the ped will be caught in a game of chicken wondering if the apparent yield is for them or for something else that will finish sooner (like a stop sign with no interfering vehicular traffic).