http://www.legislation.gov.uk/wsi/2021/101/body/madeThe M4 Motorway (Junction 28 (Tredegar Park) to Junction 24 (Coldra)) (50 mph Speed Limit) Regulations 2021enKing's Printer of Acts of Parliament2021-02-01ROAD TRAFFIC, WALES These Regulations impose a maximum speed limit of 50 miles per hour (in place of the national speed limit) on the lengths of the M4 motorway specified in the Schedule to these Regulations. 1 1 The title of these Regulations is the M4 Motorway (Junction 28 (Tredegar Park) to Junction 24 (Coldra)) (50 mph Speed Limit) Regulations 2021, and they come into force on 28 February 2021. 2 In these Regulations, “the M4 motorway” means the M4 London to South Wales motorway. 2 No person may drive a motor vehicle at a speed exceeding 50 miles per hour on the lengths of the M4 motorway specified in the Schedule. 3 The M4 Motorway (West of Junction 23A (Magor) to East of Junction 29 (Castleton)) (Variable Speed Limits) Regulations 2015 are hereby revoked. Ken Skates Minister for Economy, Transport and North Wales, one of the Welsh Ministers 29 January 2021 S.I. 2015/1018 (W. 72).