http://www.legislation.gov.uk/id/uksi/1992/1819

5.

In this Scheme—

all measurements of distance are measured along the route of the relevant highway;

(i) “the deposited plan”	means the plan number HA16/YHCPD 4 marked “The A1 Motorway (Walshford to Dishforth Section and Connecting Roads) Scheme 1992”, containing 2 maps bound to-gether and numbered 1 and 2 inclusive, signed by authority of the Secretary of State and deposited at the Department of Transport, Romney House, 43 Marsham Street, London SW1P 3PY;
(ii) “the special roads”	means all the special roads which the Secretary of State is authorised by this Scheme to provide; and
(iii) “the Motorway” and “the connecting roads”	have the meanings given in article 1 of this Scheme.