Bulgaria's Road Infrastructure Agency said it opened a tender for the construction of a 37-kilometre section of the Struma motorway which links Sofia with the Greek border.
The construction of the stretch between the towns of Dupnitsa and Blagoevgrad is estimated to cost 200 million levs ($137.4 million/102.3 million euro), VAT excluded, the agency said in a statement.
The project will be co-financed by the EU under the operational programme Transport.
The Struma motorway, with a total length of 173.28 km, is part of pan-European transport Corridor IV. The government has said it plans to complete it by 2013.