Ten consortia and five companies placed bids to build a 37 kilometre (km) section of the Struma motorway which links Sofia with the Greek border, the Road Infrastructure Agency said.
The construction of the road stretch between the towns of Dupnitsa and Blagoevgrad will be co-financed by the EU-funded operational programme Transport, the agency said in a statement following the bid-unsealing ceremony on Friday.
The estimated value of the contract is 200 million levs ($134.3 million/102.3 million euro), excluding Value Added Tax.
The Struma motorway, with a total length of 173.28 km, is part of pan-European transport Corridor IV.