If a person stops in the middle of a road, other people talk to that person, and typically learn what's going on and can help work on resolving it. Are they having a heart attack? Do they need people to push the car? Are they having a road rage incident? Are they a jerk who needs to run into a store and picked the wrong place to stop temporarily to do it? Even if the situation can't be solved, the ability to communicate (or the implication of not being able to communicate) gives predictable, human-friendly feedback which can be shared with emergency services and other people.