An Oxford University professor explained how the UK's entry into self-drive cars uses a more affordable system of lasers and camera.
Professor Paul Newman said: "When the car is driving, it is using a small, quite cheap laser on the front of the car that casts a curtain of laser light vertically around.
"As the car moves, it paints the world with this invisible laser light and produces a local idea of what the world looks like in 3D."
More top news
The man wrongly convicted for murdering Jill Dando says his 'conscience is clear' regarding the killing of the TV presenter in 1999.
Sir Mo Farah is embroiled in an extraordinary war of words with fellow distance star Haile Gebrselassie over a stay in his hotel.
While most films get a premiere, there is one franchise that gets a launch before the film is even finished.