The Road Traffic Regulation (Northern Ireland) Order 1997

2.  The Department shall publish in a newspaper circulating in the[F1 district] in which the road is situated, a notice specifying—N.I.

(a)the restrictions or prohibitions imposed or to be imposed on the use of the road;

(b)the period during which such restrictions or prohibitions are likely to be in force; and

(c)where appropriate, an alternative route or routes available for traffic.