25ish years ago I was driving my Toyota MR2 along the Cowley Road in Oxford on a Sunday morning, heading for an out of town supermarket, to pick up some groceries. Two teenage girls ran out from behind a bus that was waiting at a stop on the other side of the road, right into my path. Those who've been in a road traffic accident will know that time slows down the instant you know things are out of control. I stood on the brakes, the anti-lock braking kicked in and I slowed rapidly enough for the first girl to evade my bumper. But not the second. She went up and over. There was an almighty thud as she hit the roof, then rolled down the back, over the spoiler and onto the road. I jumped out of the car and ran back. The girl I hit was bloodied and confused. Her unscathed friend helped her to the side of the road, and I accosted passers to find someone with a mobile phone; they were rare in those days. Someone made the 999 call, and I moved my car off the main road and on to a side street, where a bystander congratulated me on not doing a runner (1), and offered a badly needed cigarette. An ambulance and police car turned up sharpish. Fortunately the girl I hit suffered cuts, bruises and shock alone. Not one broken bone. The police breathalysed me, and found me clear. I'd had a couple of pints the night before in the local, but it hadn't been a big sesh, so I was sober as a judge. Nevertheless, I was badly shaken. I drove home instead of going to the supermarket, and headed to my local for a large Scotch and a pint to calm my nerves. Some weeks later I was summonsed: the injured girl's mother was suing me. In British civil law, the driver is always culpable in an accident involving a minor, even if sober and below the speed limit, which I was. There was no need for me to turn up in court, as no facts about the accident was disputed. Compensation was awarded, the insurer paid up, and the matter was closed. Moral of the story: there but for the grace of God, don't drink & drive. Thought: who is culpable when it's a self driving car? Lasting impression: the brief few millisecs when I knew I was going to hit a child, and there was nothing I could do about it, were terrifying.