 The M9 Carlow bypass was built with lay-bys as it was originally to be built as an HQDC section of the N9 route.The lay-bys were removed after the road was reclassified as a motorway.Lay-bys on other HQDCs which were reclassified as motorways were restricted to authorised vehicles only and are likely to be used mainly by Garda Síochána (police) patrol vehicles.