A. The carrying out by a highway authority—
(a)on land within the boundaries of a road, of any works required for the maintenance or improvement of the road, where such works involve development by virtue of section 55(2)(b)(1) of the Act; or
(b)on land outside but adjoining the boundary of an existing highway of works required for or incidental to the maintenance or improvement of the highway.
Section 55(2)(b) was amended by Schedule 9 to the Planning and Compulsory Purchase Act 2004 (c. 5) and S.I. 1999/293.