Driving licences, understood as an official authorisation issued by a State permitting a person to drive power-driven vehicles, belongs to those kinds of legal documents that can potentially significantly facilitate and enhance the free movement of persons (EU citizens) between Member States. Provided that a driving licence is duly recognized by Member States other than the State issuing the licence, the holder of the licence can move to those other Member States using his/her individual means of transport, and is entitled to use power-driven vehicles there while pursuing a large number of occupations as an employed or self-employed person. Thus, a driving licence duly recognized by the host Member State enables its holder to move, work, or conduct an economic activity there more effectively and gives the holder some additional options in that regard. Moreover, the driving licence recognized by the host Member State may be used by its holder while there to prove his/her identity and nationality as a Union citizen, and, consequently, it may serve as an equivalent of a passport or identity card. This is important insofar as the requirement to hold those latter documents (or their equivalents) is a formal prerequisite under the relevant EU legislation for Union citizens exercising their rights to enter and to reside in other Member States. The practical importance of driving licences and of the legislation concerning those issues in the EU, especially in the context of free movement of persons, is additionally reinforced by the fact that a valid driving licence is held by an estimated 60% of the Union's population, which means 300 million citizens. The EU and national legislation on driving licences has an undisputed direct impact on their lives.