The western arc of the Sofia ring road is a continuation of the Lyulin motorway and is part of corridors No. 4, 8 and 10 of the Trans-European Transport Network. This section has a total length of 5529 km. It begins at km 0 + 780, which is located about 70 meters after crossing the Kakach River. The section includes three road junctions and two crossings, two flyovers, an underpass and two overpasses. The gauge of the track varies from 26.5 to 46 m. The design maximum speed is 80 km/ h. The road is classified as an urban highway class I-B.