16. The competent authority for this Chapter is the Assembly.
17.—(1) No later than 18 July 2008 the competent authority must draw up action plans for—
(a)places near first round major roads;
(b)places near first round major railways; and
(c)first round agglomerations.
(2) No later than 18 July 2013 the competent authority must draw up action plans for—
(a)places near major roads;
(b)places near major railways; and
(c)agglomerations.
(3) Paragraph (4) applies—
(a)whenever a major development occurs affecting the existing noise situation; and
(b)at least every five years after the date on which an action plan is adopted pursuant to regulation 24.
(4) The competent authority must—
(a)review; and
(b)if necessary revise,
the action plan.