It goes from Petrovac na Moru in Budva Municipality, through the capital city of Podgorica, and the towns of Kolašin and Mojkovac, to the border of Serbia north of Bijelo Polje.

[2] Most notorious part of this road is Platije Canyon, where more than 1200 people have lost their lives.

[3] Part of the Bar-Boljare motorway that was built from 2015 to 2022 is a new and safe connection between Podgorica and Kolašin avoiding Platije Canyon.

As a result, on 27 March 2014, the Ministry of Transport and Maritime Affairs officially realigned the then M-21 highway to the current alignment.

[5] In January 2016, the Ministry of Transport and Maritime Affairs published bylaw on the categorisation of state roads.