[1][2] Construction of Podvugleš Tunnel was started by Spie Batignolles and Mediteran Union Tunel.

[4] Construction of the tunnel was hindered by low air temperatures, dropping to −32 °C (−26 °F).

The cover is designed to permit ventilation of the tunnels and use of emergency exits.

[7] Traffic is regularly counted and reported by Autocesta Rijeka–Zagreb, operator of the A6 motorway and the tunnel, and published by Hrvatske ceste.

Substantial variations between annual (AADT) and summer (ASDT) traffic volumes are attributed to the fact that the motorway carries substantial tourist traffic to Istria and Kvarner Gulf resorts.