Brinje tunnel is located at 123 rd km of  Zagreb - Split - Dubrovnik  Highway at 495 m above sea level. Brinje Tunnel has two tunnel tubes, with two lane each, 3 passenger sidewalk, and one enlarged trafic areas. It is furnished by the best quality tunnel performances and accesories ( ventilation  water suply, fireprotection systems, video, electricityt, elekomunication possibilities,  etc... ..) It was completed in 12 months, average daily progress 5,5 m. Specific feture of tunnel Brinje construction is application of micro-reinforced jet cocrete for the primary excavation insurance for the first time in Croatia.

2007 Brinje Tunnel was declared The Best Tunnel in Europe by  EuroTAP.

On this project GI (Investinženjering d.o.o.) provided engineering supervision services.