D66 is a state road connecting
A9 motorway with
D8 state road in
Matulji. D66 road serves as a connection to a number of towns and resorts along the eastern coast of Istria peninsula, including
Opatija,
Lovran and
Icici, as well as to
Brestova ferry port, from which
Jadrolinija ferries fly to island of
Cres (
D100). The northern terminus of the road also provides a link towards
Rijeka via D8 state road and to Matulji interchange on
A8 motorway. The road is 90.1 km long.