Being stuck on the snow-bound M25 30-odd years ago, in an elderly unheated porsche with skinny tyres and virtually no heating, in a snow blizzard in an evening dress after a dinner, and knowing I would freeze to death if I parked up like everyone else. All the cars parked up in the slow lane, nose in to the side, just like a car park. You couldn't see signs or know where you were, everything looked so different. I thought I would stop just for a bit and have a rest after the blinding snow that had kept us crawling at about 5mph for hours. I had a nap and woke shivering at about 4am to see a snow plough slowly making its way along the motorway. I followed in its tracks, after managing to get over the mounds it made, and luckily not only was there a pretty full moon, but I recognised my turn off by the shape of the hills just before it. I still had another hour after that, but at least there was a little heat while I kept going and the fear and exhilaration of it all still stays in my memory.
Now we have better weather forecasts, better heating in cars, and mobile phones. And I am older and wiser and keep a rug in the car.