 | |
|---|---|
| Route information | |
| Length | 12.2 km (7.6 mi) |
| Major junctions | |
| From |  D21 junction in Buje |
 A9 in Umag interchange | |
| To | Umag |
| Location | |
| Country | Croatia |
| Counties | Istria |
| Highway system | |
D300 is a state road connecting A9 with Umag and D21 state road in Buje. The road is 12.2 km long.
The road, as well as all other state roads in Croatia, is managed and maintained by Hrvatske ceste, state owned company.
Traffic is regularly counted and reported by Hrvatske ceste, operator of the road. Substantial variations between annual (AADT) and summer (ASDT) traffic volumes are attributed to the fact that the road connects A9 motorway carrying substantial tourist traffic to Umag, a major summer resort.
| D300 traffic volume | ||||
| Road | Counting site | AADT | ASDT | Notes |
| D300 |
2705 Grando | 5,284 | 6,636 | The westernmost traffic counting site on D300. |
| D300 |
2718 Buje west | 6,335 | 8,571 | The easternmost traffic counting site on D300. |
 | This article contains a bulleted list or table of intersections which should be presented in a properly formatted junction table. (November 2021) |
| D300 junctions/populated areas | |
| Type | Slip roads/Notes |
 |
D21 to Krasica and to Kaštel border crossing to Slovenia. Eastern terminus of the road. |
|
Ž5070 to Brtonigla |
 |
Umag interchange: A9 motorway to Pula (to the south) and to Ž5002 road (to the north) which serves as a short connecting road to D200 and D510 state roads leading to border crossings Kaštel and Plovanija to Slovenia. |
|
L50011 to Kršete and Brtonigla |
 |
Materada |
|
Juricani L50008 to Čepljani |
|
Petrovija L50006 to Vilanija |
|
Finida |
|
Umag: Ž5002 to Novigrad to the south and Savudrija to the north Western terminus of the road. |