Highway 1 is a major highway in Serbia, stretching from the capital city of Belgrade to the border with Montenegro. It is one of the most important highways in the country, connecting many of Serbia's major cities and towns. The highway is a two-lane road, with a
From Wikipedia
The Brotherhood and Unity Highway, officially classed as the M-1 highway, was a highway that stretched over 1,182 km (734 mi) across Yugoslavia, from the Austrian border at Jesenice in the northwest via Ljubljana, Zagreb, Belgrade and Skopje to Gevgelija on the Greek border in the southeast. It was the main highway in the country, connecting four constituent republics and the country as a whole with neighboring highways.