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
European Union leaders are attending a special summit later to formally agree their Brexit negotiating strategy.
Most places across the UK will stay dry all day, with sunny spells, particularly in the south.
The Royal Marine jailed for killing an injured Taliban fighter in Afghanistan has spoken for the first time since being released from jail.