[1] The motorway in operation is divided into two sections — the first one links the capital Sofia with Boaza near Yablanitsa, crossing Stara planina (Balkan Mountains), and the second segment connects Varna and Buhovtsi near Targovishte.

The groundbreaking ceremony was attended by the First Secretary of the Bulgarian Communist Party (BCP), Todor Zhivkov.

The construction of the Pravets–Yablanitsa section began in 1984 but ceased in the late 1980s due to lack of funds to eventually be finished in 1998–1999.

[3] The 12.8 km section connecting Shumen with Kaspichan to the east was opened on 30 December 2005 and cost 77.6 million leva.

[7] In October 2019, а 9.3 km segment, connecting Yablanitsa with the I-4 road near the Boaza ravine of Vit, was inaugurated.