http://www.legislation.gov.uk/uksi/1988/917/signature/madeThe (A1237) York Outer Ring Road (Northern) (Trunking) Order 1988Roads and highwaysKing's Printer of Acts of Parliament2011-07-04HIGHWAYS ENGLAND AND WALESSigned by authority of the Secretary of State.J.F. BallardRegional Director Yorkshire and Humberside RegionDepartment of Transport20th May 1988