Cars that can drive themselves may seem like the technology of TV and films, but research is under way which could make this sci-fi vision a reality.

But that raises a problem for pedestrians - how will you know whether it's safe to cross the road, if you can't look the driver in the eye?

As part of the BBC News - What If? season looking at the future, Theo Leggett has been looking at the cutting edge of car technology - and meeting a car which interacts with pedestrians.