Smart motorways: are they really that clever?

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Motorists breaking the rules on so called smart motorways have been receiving the first batch of fines for the offences. Smart motorways were sold as a clever way of making more of the motorway capacity by using dynamic signage and technology. But are they any good? Do they work? And are they smart? Peter White finds out. First broadcast on You & Yours, 19 July 2019.