The Sofia ring road is divided into four sections (arcs), at south, north, west and east. A major part of southern arc has been significantly upgraded in several stages between 2007 and 2012, providing now a conflict-free connection between the
Boyana and the
Mladost IV junctions. with a proposal to be upgraded with an
EIB loan. The eastern arc, which lies between the
Trakia motorway (A1) and the
Hemus motorway (A2), is grade-separated and provides three traffic lanes and a hard shoulder in each direction. Though, it's not signed as a motorway and a speed limit applies. In the northern part of city, the
Northern Speed Tangent connects the Mramor village with the
Hemus motorway. It is a
controlled-access highway, designed to carry the transit traffic and supersedes the existing northern arc. the construction works began in 2015. and it was inaugurated in April 2016. The western arc is completely upgraded to a
grade-separated status, between the
Lyulin motorway (A6) and the Northern Speed Tangent. and 2015. The second section, between the Kakach river and the Northern Speed Tangent, was tendered in 2013 but the tender later failed. A second tender was announced in 2014 and the construction began in October 2015. == See also ==