Road I-8 begins from Kalotina checkpoint, at the border with Serbia.

Kalotina motorway is planned to replace and supersede I-8 between Sofia and the Serbian border.

At Novi Han, road I-8 leaves the motorway and takes a steep climb to Vakarel.

Then, the road bypasses Ihtiman and Kostenets, from where it follows the Maritsa river.

The road ends at the Kapitan Andreevo border crossing to Turkey.