the bbc has discovered alarming evidence about the safety of so—called smart motorways, which is when the hard shoulder is opened to traffic to increase capacity. data obtained by the panorama programme has revealed that in the last two years, equipment on smart motorways was hit by hundreds of power cuts, meaning there were times when signals, cameras and radar detection systems weren't working for days at a time. national highways says smart motorways are still the safest roads in britain. richard bilton reports. break down on a smart motorway and you could be in trouble. there are emergency lay—bys, is the government is building more, but if you can't make it, you're trapped in a live lane. what's supposed to keep you safe is technology — cameras, radar and signals — but it can't help you if it's not working. we found that on a regular basis,

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