In accordance with Directive 2003/59/EK, in order to improve the qualifications of professional drivers and separate professional drivers from non-professional drivers of vehicles of categories D1, D1E, D, DE or C1, C1E, C, CE, who carry out commercial transport, once every five years of regular training. The Directive applies to EU citizens and third-country nationals who work in companies registered in EU countries and carry out commercial transport.