Cruise control, anti-lock brakes, traction control – these are all examples of technologies that started life in high-end cars commanding more money than the majority of us could afford. But nowadays, you’d be hard-pressed to find a car that doesn’t come with them all. The same is likely to happen with many technologies that are currently out of our reach. But which one of these technologies would you most like to see trickle down to cheap cars in the future?