Location Reference Indicators (LRIs) are deployed along the Irish National (including motorway) dual-carriageway road network, and are very similar, both in design and purpose, to the Driver Location Signs (DLS) used in the UK (eg SE3009 : Driver Location Sign at Bence Lane Bridge). The first line of text displayed on an LRI indicates the road being travelled on (in this example, the M9). The second row indicates the compass direction in which the driver is travelling, which can only be N(orth), S(outh), E(ast), or W(est). The third row indicates the number of kilometres from the beginning of the road. These signs are typically placed on the nearside verge and are position at 500m intervals.
The M9 motorway runs for 119 km (74 miles) north to south, linking the M7 between Naas and Newbridge near Kilcullen to Waterford. It was opened in sections between 1994 and 2010; the final section opened on 9 September 2010. Prior to July 2008, the majority of the M9 – from Junction 2 onwards – was to be built as High Quality Dual Carriageway. Due to the passing of a Statutory Instrument in that month, a large section of the route was re-designated to motorway standard. The section included the motorway under construction between Kilcullen and Powerstown and the (then) newly opened Carlow bypass. The remainder of the route has since been redesignated as motorway.