Logica Ceska Republika has offered to do the job for 3.8 million levs ($2.5 million/1.9 million euro), the ministry said in a statement.
The other bidders are a consortium called Toll Bulgaria which came up with a price of 4.1 million levs, and a consortium of British companies Ove Arup & Partners International and Transport Logic Ltd, and Centralpoint Bulgaria, with a 3.9 million levs offer.
Currently, Bulgaria charges motorists for the use of its major roads and motorways using road tax vignettes. While the vignettes are valid for a year, month or week irrespective of the travel distance, road tolls are pegged to the actual travel mileage.
(1 euro = 1.95583 Bulgarian levs)