It goes through the center of the town of Etropole,[2] continues along the upper of valley of the Malki Iskar and near its source it cuts through the Balkan Mountains via the serpentine Zlatitsa Pass (1,365 m).

The road then ascends along the northern slopes of the Sredna Gora mountain range, which it overcomes at the village of Panagyurski kolonii, and after a 15 km descent reaches the town of Panagyurishte.

[2] From the town it follows the valley of the Luda Yana, passing through the villages of Bata, Popintsi, Levski and Sbor, where it exits the southern slopes of Sredna Gora and enter the western parts of the Upper Thracian Plain.

[2] The road then reaches the Batak Reservoir and begins a long gradual ascend of the Batak Mountain, passing by the reservoirs of Beglika, Golyam Beglik and Shiroka Polyana via the Dospat Pass (1,600 m).

[2] The road continues for another 6 km south of the town until its terminus at the village of Barutin.