gambling vs crypto-What are smart motorways and are they dangerous?

A sign announcing works by Highways England to convert the M4 into a "smart motorway" close to Junction 5, pictured in April 2021Image source, Getty Images

Conservative leadership hopeful Liz Truss has said she would scrap smart motorways where they are not working, if she becomes prime minister.

She said the "experiment" in all-lane running smart motorways "hasn't worked", and that she would "stop them if they are not working as soon as possible".

The government has already agreed that no more new all-lane running smart motorways will be built across the UK, until their safety has been comprehensively assessed.

These use the hard shoulder as an extra lane of traffic, but critics claim they have led to road deaths.

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