The steel central reservation is being replaced with a more modern, concrete barrier, which is even stronger than the metal ones and helps to significantly reduce the risk of vehicles crossing over from one carriageway to another. The work is taking place on seven sections of dynamic hard shoulder motorway – where the hard shoulder is used by traffic in busy periods – and begins in the Midlands this month. Work will start on the M6 between junctions 4 (Coleshill) and 5 (Castle Bromwich) on 14 March and is set to be completed by autumn. Paul Unwin, who is overseeing the upgrades for National Hi…