The Montenegro Bar-Boljare Highway is the major project in cooperation of China-Central & Eastern European Countries. The project connects the southern port city BAR in the south of Montenegro Republic and its northern city BOJIARE. As the first highway in the country, it will be part of the international highway network upon completion that connects many countries in the Central and Eastern Countries, thus having great significance for stimulating economic growth in the Montenegro Republic. After discussed and studied for many times, the Montenegro Bar-Boljare Highway project department decided to select XTR260 cantilever type tunnel boring machine to dig the tunnels. The Section Four in the project, where XTR260 worked, was constructed by CCCC Tunnel Engineering. Located in Kolasin in the north of Montenegro, Section Four is 9.066km long. Having four lanes in two directions, 72% of the section has bridges and tunnels with tunnels accounting for 50%. XTR260 cantilever type tunnel boring machine, because of its “leading technologies, reliable quality and premium service”, as rated as the Star Machinery in Montenegro Bar-Boljare Highway Project by the project department of CCCC Tunnel Engineering.