Struma Motorway 2024
Inforegio - Tunnel Zheleznitsa inaugurated in Bulgaria: the longest and most modern road tunnel in the country built ... European Commission
Bulgarian Highway Project Could Be A Road To Environmental Disaster Radio Free Europe / Radio Liberty
Bulgaria opens 110 mln euro Zheleznitsa road tunnel for traffic SeeNews
Struma Highway's New Jewel: Zheleznitsa Tunnel Opens to Traffic Novinite.com