We won't build any more': Drivers have been killed on so-called dynamic smart motorways due to delays in installing technology, admits road chief as he rules out creating new ones

Drivers are killed on supposed good motorways owing to delays in putting in technology to identify broken-down vehicles, the boss of Highways England said yesterday.

In 2016 road chiefs secure to put in ‘stopped vehicle detection’ systems across the network of good motorways.

But 3 years later, solely a fifth of the network has been fitted with the life-saving radio detection and ranging technology. Therein time....