sentences:  The road carries significant cargo and tourist traffic as the largest-capacity road link between the Istrian and Kvarner Gulf regions and the nation's capital, Zagreb.Most of the road has a design speed of ; the part meeting full motorway standards has a design speed of .The final segment of the route – between the Učka tunnel and the Matulji interchange – has a design speed of because of the mountainous terrain crossed and proximity of residential structures.