I always tend to pull up and have my window down close enough to where someone on the scene can hear me and ask if any assistance is needed. But once I did stop, it was like people were doing shot gun, taking patience out of vehicles left and right, guess what I assisted with lol, I assisted the state cop with the dog to the vet office, in which she didnt make it either I heard the next day.. So we all wonder , I think use your first instinct , it will come to you whether or not to stop..