Tuhobić Tunnel is one of the most significant structures on the Croatian A6 motorway route. As it is 2,143 metres (7,031 ft) long (southbound tube), Tuhobić Tunnel is the longest tunnel on the A6 motorway route. The tunnel is located at 700 metres (2,300 ft) above sea level, connecting Gorski Kotar and Croatian Littoral regions. The tunnel is located between Vrata and Oštrovica interchanges.
Tunnel excavation started in 1996, and the first tunnel tube opened in 1997, along with some sections of Rijeka–Zagreb motorway. Since the motorway was initially executed as a semi-motorway, the second tunnel tube was not excavated for a decade — its construction started August 2006, excavation was completed in August 2007, and the completed motorway, including the second Tuhobić Tunnel tube was opened on October 22, 2008. The tunnel is tolled within the A6 motorway closed toll collection system. There are no other toll plazas related to use of the tunnel.