Fully autonomous cars will be on UK roads as early as 2021, according to Secretary of State for Transport. Speaking at a gathering of insurance chiefs in London, Chris Grayling, head of the Department for Transport, said: "I expect self-driving cars to be on the road by 2021."

We take a look at the government's call for evidence to see how a technology called Automated Lane-Keeping System (ALKS) could fit into the current road network.