The M4 Motorway (West of Junction 23A (Magor) to East of Junction 29 (Castleton)) (Variable Speed Limits) Regulations 2015
The power to make regulations with respect to the use of special roads under section 17(2) and (3) of the Road Traffic Regulation Act 1984 (except with respect to special roads generally) lies with the Welsh Ministers so far as they are exercisable in relation to Wales.