D39 is a state road connecting the Aržano and nearby border crossing to Bosnia and Herzegovina D8 state road north of Brela.

The D8 state road is the Croatian section of the Adriatic Highway, running from the Slovenian border at Pasjak via Rijeka, Senj, Zadar, Šibenik, Split, Opuzen and Dubrovnik to the border with Montenegro at Karasovići. Most of the D8 state road remains single carriageway, though with some dual carriageway stretches. The total length of the road through Croatia is 643.1 kilometres (399.6 mi).