I stopped at an accident on the motorway yesterday - no-one hurt, fortunately - where a woman had fainted while driving at 70 on the motorway. The lorry behind her had stopped as well and got out. According to the lorry driver the car in front had started to wobble a bit, swerved from side to side and then dropped off the edge into a deep grassy culvert. Fortunately she wasn't hurt - if she'd gone off the road at a steeper angle the car wouldn't have followed the culvert but ploughed a substantial post-and-rail fence. Since they had a working phone (coverage is patchy there, but I have a decent phone aerial and other radios) and a passing ambulance car had stopped, I cleared off and left them to it. Heat + tiredness + probably a bit dehydrated could have really ruined her afternoon.