Thirty-eight people have been killed on smart motorways in the last five years, the government has told BBC Panorama.
It is the first time that the total number of deaths has been reported.
Smart motorways have been criticised because they do not have a hard shoulder and drivers who break down can be trapped in the speeding traffic.
The network is facing an overhaul with the results of a government review due to be announced shortly.
A Freedom of Information (FoI) request sent by Panorama to Highways England revealed that on one section of the M25, outside London, the number of near misses had risen 20-fold since the hard shoulder was removed in April 2014.
In the five years before the road was converted into a smart motorway there were just 72 near misses. In the five years after, there were 1,485.
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