(1) The responsible Ministers may delegate to the Board the function of approving a minor amendment of—
(a) a guideline mentioned in section 653; or
(b) an approval mentioned in section 654.
(2) In this section—
"minor amendment", of a guideline or approval, means an amendment of the guideline or approval in a minor respect—
(a) for a formal or clerical reason; or
(b) in another way that does not—
(i) increase a safety risk; or
(ii) increase a risk of damage to road infrastructure; or
(iii) cause an adverse effect on public amenity; or
(iv)
make a person liable to a penalty.