The Traffic Signs Manual (published in December 1996 and supplemented on 7 August 2003 under Circular Letter RST 9/2003) constitutes a direction given by the Minister for Transport to road authorities in relation to traffic signs. The contents of the Manual is the subject of a comprehensive review and updating process at present.

A Circular letter RST 1/2007 of 7 February 2007 contains details of directions given by the Minister for Transport to road authorities in relation to a range of non-regulatory traffic signs including an updated version of Chapter 8 of the Traffic Signs Manual titled Temporary Traffic Measures and Signs for Roadworks. The updated Chapter 8 which is issued on an interim basis in advance of the completion of the review of the full 1996 Manual, must be read in conjunction with the other chapters of the Traffic Signs Manual (1996).