The road starts at Km 80.1 of the first class
I-3 road north of the village of
Grivitsa in the
Danubian Plain and heads southwest to the city of
Pleven, passing through its center. It then turns south, crosses the Pleven Heights and the village of
Brestovets and enters
Lovech Province. The road passes through the eastern part of the Lovech Heights and reaches the city of
Lovech and the valley of the river
Osam. It continues southwards of the city ascending the Osam valley along the left bank of the river. It intersects with the first class
I-4 road at the latter's Km 50, passes through the Mikrene Heights and reaches the town of
Troyan. From Troyan the road continues along the left bank of the river Beli Osam, runs through the village of
Balkanets and begins to ascend the northern slopes of the Troyan Mountain, a division of the central
Balkan Mountains. It cuts through the mountain range via the serpentine
Troyan Pass (1,565 m), also known as Beklemeto, and enters
Plovdiv Province and
Karlovo Valley. There, the road reaches its terminus in the village of
Karnare, where it intersects with the first class
I-6 road at the latter's Km 252. == References ==