Public transportation within Banja Luka is exclusively operated by the bus services. Over thirty bus lines connect downtown with the rest of the city and its suburbs. The oldest bus link in the city is line No 1. Taxis are also readily available. The expressway E-661 (locally known as M-16) leads north to Croatia from Banja Luka by way of Gradiška, near the Bosnian/Croatian border. A wide range of bus services are available to most neighbouring and larger towns in Bosnia and Herzegovina, as well as to regional and European destinations such as Austria, Belgium, Croatia, Germany, France, Italy, Montenegro, The Netherlands, Serbia, Sweden, Switzerland and Slovakia.