The speed limit on one of Britain’s busiest motorways is to be cut from 70mph to 60mph under a controversial plan to meet European Union pollution targets. The first ‘environmental’ speed limit is set to be imposed within months on a 32-mile stretch of the M1 – for seven days a week, from 7am to 7pm The limit will be in place for several years, and any driver caught breaking it faces a hefty fine and penalty points on their license.