| Country: | HRV |
| Type: | D |
| Route: | 203 |
| Length Km: | 11.2 |
| Length Round: | 1 |
| Terminus A: | Brod na Kupi border crossing to Slovenia |
| Terminus B: | D3 in Delnice |
| Counties: | Primorje-Gorski Kotar |
| Cities: | Delnice |
D203 is a state road in Gorski Kotar region of Croatia connecting Brod na Kupi and nearby border crossing to Slovenia to D3 state road in Delnice, and the road also serves as a connecting road to the A6 motorway as it terminates near Delnice interchange.[1] The road is 11.2km (07miles) long.[2]
The D30 and all other state roads in Croatia are managed and maintained by Hrvatske ceste, state owned company.[3]
Traffic is regularly counted and reported by Hrvatske ceste, operator of the road.[4] Substantial variations between annual (AADT) and summer (ASDT) traffic volumes are attributed to the fact that the road serves as an approach to the Croatian A6 motorway carrying considerable tourist traffic.
| D203 traffic volume | |||||||||
| align=center bgcolor=00c0f0 | Road | align=center bgcolor=00c0f0 | Counting site | align=center bgcolor=00c0f0 | AADT | align=center bgcolor=00c0f0 | ASDT | align=center bgcolor=00c0f0 | Notes |
| D203 | 2902 Brod na Kupi | align=center | 1,120 | align=center | 2,292 | Between the Ž5033 and L58022 junctions. |