Bulgaria has invited bids for the supervision of the construction of 37 kilometres (km) of the Struma motorway which connects Sofia with the Greek border, a notice in the European Union's procurement journal indicated.
The project has an indicative cost of 5.2 million levs ($3.5 million/2.7 million euro), the notice in the Tenders Electronic Daily (TED) showed.
Bids have to be submitted by February 18 and are planned to be opened on the following day.
The project has to be completed in 27 months.
The construction of the road section between the towns of Dupnitsa and Blagoevgrad is co-financed by the EU-funded operational programme Transport.
At the end of last year, Bulgaria's Road Infrastructure Agency said it had opened three bids for the construction of the section, which is expected to begin in the spring and to be completed in 2015.
The Struma motorway, with a total length of 173.28 km, is part of pan-European transport Corridor IV.