The principal guidelines issued to local authorities in relation to works on roads are outlined below. All guidelines are standard and do not differ from one authority to the next. The guides areas follows: Guide to Road Safety Engineering in Ireland; Guidelines on the Depth of Overlay to be used on Rural Non-National Roads Guidelines for the Opening, Backfilling and Reinstatement of Trenches in Public Roads; Local Improvements Scheme Memorandum; Guidelines for the Rehabilitation of Roads over Peat;Traffic Management Guidelines; Guidelines for Road Drainage; Work Methodologies on Non-National Roads; Guidance for the Control and Management of Traffic at Roadworks; Traffic Signs Manual; Guidelines for the Application of Special Speed Limits; Procurement Procedures; Memorandum on Grants for Regional and Local Roads; Design Manual for Urban Roads and Streets.