Languages of the European Union which is understood by 51% of all adults, while German is the most widely used mother tongue, spoken by 18%. All 24 official languages of the EU are accepted as working languages, but in practice only two – English and French – are in wide general use and of these English is the more commonly used. French is an official language in all three of the cities that are political centres of the Union: Brussels (Belgium), Strasbourg (France) and Luxembourg City (Luxembourg). , the official languages of the European Union, as stipulated in the latest amendment of "Regulation No 1
Strasbourg in July 2016. Strasbourg also has its own airport, serving major domestic destinations as well as international destinations in Europe and northern Africa. The airport is linked to the "Gare de Strasbourg" by a frequent train service. City transportation in Strasbourg includes the futurist-looking Strasbourg tramway that opened in 1994 and is operated by the regional transit company Compagnie des Transports Strasbourgeois (CTS), consisting of 6 lines with a total length of . The CTS also operates a comprehensive bus network throughout the city that is integrated with the trams. With more than of bicycle paths, biking in the city