http://www.legislation.gov.uk/uksi/2017/77/signature/madeThe M5 Motorway (Junctions 4a to 6)(Variable Speed Limits) Regulations 2017enKing's Printer of Acts of Parliament2018-01-05ROAD TRAFFIC;SPECIAL ROADSThese Regulations introduce variable speed limits to the M5 Motorway from junctions 4a to 6 and on associated slip roads and linking carriageways.Signed by authority of the Secretary of State for TransportJohn HayesMinister of StateDepartment for Transport30th January 2017