Speed limit on 34-mile stretch of M1 to be limited to 60mph to cut air pollution | UK news | The Guardian

Speed limit on 34-mile stretch of M1 to be limited to 60mph to cut air pollution |

I doubt that this will make a difference.More likely to lead to jams. The Germans have a good plan in their cities.If there is a line of cars stopped at lights, for instance, then each third car switches off.