This order establishes the legal framework for the variation of slip roads associated with the A3 London-Portsmouth trunk road between Ham Barn and Petersfield. The document serves as a formal instrument of the British government, exercising powers granted under the Highways Act 1980 to modify existing infrastructure plans. It provides the necessary statutory authority to alter the design and implementation of specific road junctions to ensure compliance with regional transport requirements.

Legal professionals and government archivists utilize this document as a primary source for verifying the regulatory history of the A3 trunk road. It is a highly technical, administrative text intended for use in legal research and infrastructure compliance.