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).

The Adriatic Highway is a road that stretches along the eastern coast of the Adriatic Sea and is part of the European route E65. The road passes through Croatia, with smaller stretches through Bosnia and Herzegovina and Montenegro and ends at the Montenegro-Albania border. It is an undivided two-lane road for almost its entire length, with the exception of a short stretch through Zadar and a 24 kilometres (15 mi) dual-carriageway section from Plano (Trogir) to the southeast suburbs of Split. It was planned in the 1930s and built in the 50s and 60s. The dual carriageway is planned to be extended further southeast to Omiš. Completion of the Adriatic Ionian motorway is proposed in order to replace Adriatic Highway as a high-performance road transport route along the Adriatic coast.