http://www.legislation.gov.uk/uksi/2015/1701/regulation/2/made
The M1 Motorway (Junctions 28 to 35a) (Variable Speed Limits) Regulations 2015
en
King's Printer of Acts of Parliament
2015-09-25
ROAD TRAFFIC
SPECIAL ROADS
These Regulations introduce variable speed limits to the M1 Motorway from junctions 28 to 35a and on associated slip roads and linking carriageways.