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. The traffic count is performed using analysis of toll ticket sales. See also A6 motorway List of longest tunnels References Road tunnels in Croatia Buildings and structures in Primorje-Gorski Kotar County Tunnels completed in 2000 Transport in Primorje-Gorski Kotar County