"I was in traffic in London once and had a problem with some people in front. They tried to beat me up and get me out of the car. I locked the doors and eventually drove up on the pavement and got away from them. It's kind of to do with that. It explains how you can feel safe inside a car in the modern world... When you're in it, your whole mentality is different... It's like your own little personal empire with four wheels on it."