sentences:  The largest volume was recorded in the Učka Tunnel; it represents the only high-performance link between Istria and the rest of the Croatian motorway network.The differences between the AADT and ASDT traffic volumes in 2010 are attributed to the motorway's carriage of substantial tourist traffic to the Adriatic Sea resorts along the Istrian peninsula.On average, the A8 motorway's ASDT is at least 65% more than the AADT.