Crossing the road should be a simple task. But many pedestrians know only too well the challenges of navigating speeding traffic and impatient drivers.
And when self-driving cars come along, it won't even be possible to catch the eye of a human driver to check it's safe before stepping onto the tarmac.
Happily, carmaker Jaguar Land Rover believes it has a solution. It has come up with a way to signal to other road users what a self-driving vehicle is about to do.
The system, part of a project to develop people's trust in autonomous technology, allows a self-driving vehicle to project its direction of travel onto the road ahead, using a series of adjustable bars.
So one day, if you see a series of lines appear on the road in front of you, it might be a self-driving vehicle letting you know it's about to stop, pull away or turn. Or, of course, you might be looking at the markings of a good, old-fashioned pedestrian crossing.