The validity of a regional public transport plan is not affected by—
(a) the approval or variation of a regional land transport strategy; or
(b) a failure by a regional council (or in the case of the Auckland region, the Auckland Regional Council) to approve a regional land transport strategy within the time required by section 74 of the Land Transport Management Act 2003; or
(c) the failure of a regional council to complete the review of the regional public transport plan within the time required by section 21(1)(b); or
(d) the inclusion of any matter that—
(i) is not referred to in a regional land transport strategy; and
(ii) is not inconsistent with a provision in that strategy.