Roadworthiness testing of commercial vehicles, including buses, is carried out by authorised testers appointed by county councils and city councils. Bus Éireann is among these authorised testers and operates eight test centres countrywide in which testing of the company's own, as well as other, vehicles is carried out.
The scheme of roadworthiness testing of commercial vehicles is monitored by authorised officers appointed by the local authorities. These officers have power to enter testing premises to ensure tests are being carried out in a fit and proper manner and in conformity with regulatory requirements. They may also inspect the premises, equipment and records. The Department has recommended to local authorities that authorised test centres should be inspected every month.