D30 is a state road in central Croatia connecting Velika Gorica, Petrinja and Hrvatska Kostajnica[maps 1] to Croatian motorway network at the A3 motorway Kosnica interchange and to the City of Zagreb via Radnička Road.

[1] The road is 79.7 km (49.5 mi) long.

[2] As with all state roads in Croatia, the D30 is managed and maintained by Hrvatske ceste, state owned company.

[3] Traffic is regularly counted and reported by Hrvatske ceste, operator of the road.

[4] Sections of the road running through Velika Gorica and Petrinja are not covered by the traffic counting sites, but the section is assumed to carry a substantial volume of urban traffic in addition to the regular D30 traffic.