By Adam Vaughan
Smart motorways in the UK have come under fireDawson Images/AlamyThe UK government has pledged to make smart motorways safer by rolling out a radar detection system within the next the three years, but New Scientist can reveal that this is in place on just 7 per cent of roads today.
Smart motorways involve more direct traffic management measures than conventional ones, including variable speed limits to ease congestion and use of hard shoulders when traffic is slowing. They are enforced by cameras, with information conveyed to drivers via gantries.
The measure has been rolled out across the UK to ease traffic flow, but have recently come in for criticism that many of them lack a hard shoulder, making them unsafe in the event of cars breaking down.
Find out the full story here