I live in the UK and have driven on various European countries and all down the US West coast. LA had easily the worst and most aggressive drivers of all. It was terrifying; one moment you're trying to squeeze onto the highway between two cars that absolutely won't budge an inch, the next moment you're being overtaken on both sides simultaneously by cars going over the speed limit. I also passed two fresh car-totalling crashes in two days, which I've never experienced elsewhere.