The Road Traffic (Licensing of Drivers) Regulations, 1999, updated and consolidated the Irish driver licensing regime in line with the requirements of EU directives on driving licences. The principal change in relation to the granting of driving licences with categories C and D entitlement related to the introduction of a requirement for the holders of such licences to undergo periodic medical examination for licence renewal purposes. Changes were also made to the general standards of physical and mental fitness required to be met in order for licences to be issued. In addition, eligibility for a provisional licence for category C1 was made dependent on the applicant holding a driving licence in category B.