D3 is a state road in western parts of Croatia connecting Rijeka on the Adriatic coast to Zagreb, Karlovac and Varaždin, as well as to the Goričan border crossing to Hungary.{{cite map|publisher=OpenStreetMap|url=http://www.openstreetmap.org/relation/1208486|title=Overview map of the D3|access-date=December 21, 2013}} Furthermore, the D3 is used as a parallel road to a number of motorways in Croatia – namely the A4 motorway north of Zagreb, the A1 motorway between Zagreb and Bosiljevo 2 interchange south of Karlovac and finally the A6 motorway between Bosiljevo 2 interchange and Rijeka – and it connects to nearly all motorway interchanges on that route either directly or via connecting roads.{{cite news | newspaper = Narodne novine | language = hr | url = http://narodne-novine.nn.hr/clanci/sluzbeni/305463.html | title = Regulation on motorway markings, chainage, interchange/exit/rest area numbers and names | date = May 6, 2003}} The road is {{convert|218.4|km|abbr=on}} long.{{cite news | newspaper = Narodne novine | language = hr | url = http://narodne-novine.nn.hr/clanci/sluzbeni/2013_06_66_1314.html | title = Decision on categorization of public roads | date = June 4, 2013}}

The D3 state road is concurrent along parts of its route with other state roads, most notably the D1 between Zagreb and Karlovac, as well as some sections of the A4 (south of Popovec interchange) and the A3 (between Ivanja Reka and Lučko interchanges) motorways. The A3 and A4 motorway sections that are concurrent with the D3 state road are also a part of Zagreb bypass and are not tolled.

The road, as well as all other state roads in Croatia, is managed and maintained by Hrvatske ceste, a state-owned company.{{cite news | newspaper = Narodne novine | language = hr | url = http://narodne-novine.nn.hr/clanci/sluzbeni/2004_12_180_3130.html | title = Public Roads Act | date = December 14, 2004}}

Traffic volume

Traffic is regularly counted and reported by Hrvatske ceste, operator of the road.{{cite web | publisher = Hrvatske ceste | url = http://www.hrvatske-ceste.hr/UserDocsImages/PDF/CroDig2013.pdf | title = Traffic counting on the roadways of Croatia in 2013 - digest | date = May 2014 | access-date = 2014-07-19 | archive-url = https://web.archive.org/web/20140729211743/http://www.hrvatske-ceste.hr/UserDocsImages/PDF/CroDig2013.pdf | archive-date = 2014-07-29 | url-status = dead }}

class="wikitable"

colspan=5 bgcolor=blue align=center style=margin-top:15 | D3 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

25px D3

| 1302 Goričan

| align=center | 1,012

| align=center | 1,694

| Between the border crossing and Ž2032 junction.

25px D3

| 1315 Štefanec

| align=center | 3,681

| align=center | 3,928

| Adjacent to the Ž2022 and junction.

25px D3

| 1234 Čakovec

| align=center | 7,931

| align=center | 8,176

| Between the D20 and Ž2031 junctions.

25px D3

| 1205 Pušćine

| align=center | 10,783

| align=center | 11,130

| Adjacent to the D208 junction.

25px D3

| 1221 Novi Marof

| align=center | 6,821

| align=center | 7,107

| Adjacent to the Ž2136 junction.

25px D3

| 2003 Blažev Dol

| align=center | 7,354

| align=center | 7,215

| Adjacent to the Ž3016 junction.

25px D3

| 2032 Belovar

| align=center | 11,169

| align=center | 10,576

| Adjacent the Ž1006 junction.

25px D3

| 3003 Duga Resa

| align=center | 9,949

| align=center | 11,039

| Between the Ž3181 and D23 junctions.

25px D3

| 3005 Vrbovsko

| align=center | 1,168

| align=center | 1,845

| Adjacent to the L58032 junction.

25px D3

| 2937 Skrad

| align=center | 1,229

| align=center | 1,788

| Adjacent to the L58032 junction.

25px D3

| 2905 Delnice

| align=center | 5695

| align=center | 7560

| Between the D203 and D32 junctions.
The AADT figure estimated by Hrvatske ceste.

25px D3

| 2935 Gornje Jelenje

| align=center | 2,662

| align=center | 3,903

| Between the Ž5032 and D501 junctions.

Road junctions and populated areas

class="wikitable"

colspan=2 bgcolor=blue align=center style=margin-top:15 | D3 junctions/populated areas

align=center bgcolor=00c0f0 | Type

| align=center bgcolor=00c0f0 | Slip roads/Notes

17px

| Goričan border crossing to Hungary.{{cite news | newspaper = Customs Administration of the Republic of Croatia | language = hr | url = http://www.carina.hr/CURH/Dokumenti/Globalni/Karta_Carinarnica_RH.pdf | title = Map of border crossings and customs office areas | date = March 6, 2008}}
25px Route 7 to Letenye, Hungary.
The northern terminus of the road.

17px

| 25px A4 in Goričan interchange to motorway border crossing to Nagykanizsa, Hungary via the Hungarian M7 motorway (to the north) and to Čakovec, Varaždin and Zagreb (to the south).
Ž2026 to Goričan, Donji Kraljevec and Prelog (D20).

25px

| Hodošan
Ž2003 to Turčišće, Miklavec, Mursko Središće (D209) and Sveti Martin na Muri.

17px

| Ž2034 to Donji Kraljevec and Draškovec (D20).

25px

| Sveti Juraj u Trnju
Ž2033 to Prelog and Otok.

25px

| Donji Pustakovec

17px

| Ž2024 to Palinovec.

25px

| Palovec
Ž2023 to Turčišće.

25px

| Mala Subotica
Ž2022 to Belica, Orehovica and D2 state road.

25px

| Štefanec

17px

| 25px D20 to the A4 motorway Čakovec interchange, Prelog, Đelekovec and Koprivnica (D2).

25px

| Čakovec
25px D209 to Šenkovec and Mursko Središće border crossing to Lendava, Slovenia.
Ž2020 to Totovec and Kuršanec.

25px

| Nedelišće
25px D208 to Trnovec border crossing to Ormož, Slovenia.
Ž2015 to Slakovec and Brezje (D227).

25px

| Pušćine

25px

| Gornji Kuršanec
Ž2020 to Kuršanec, Totovec and Čakovec.

25px

| Varaždin
25px D2 to Ludbreg (to the east). The D2 and D3 roads are concurrent to the south of the junction.

17px

| 25px D2 to Hrašćica and Dubrava Križovljanska border crossing to Ptuj, Slovenia (to the west). The D2 and D3 roads are concurrent to the north of the junction.
25px D528 to the A4 motorway Varaždin interchange.

25px

| Turčin
Ž2048 to Varaždin.
Ž2250 to Varaždinske Toplice (D24).
Ž2086 to Tomaševec Biškupečki.

| Presečno
Ž2109 to Oštrice and Petkovec Toplički (D24).

25px

| Novi Marof
25px D22 to Križevci (D41) and Sveti Ivan Žabno (D28).
25px D24 to Zabok (D1) and Ludbreg (D2).
Ž2050 to Remetinec, Beletinec, Sveti Ilija and Beretinec.
Ž2136 to Ključ.

17px

| Ž2135 to Grana (D24) and Možđenec (D22) .

17px

| Ž2134 to Donje Makojišće and the D24 state road.

25px

| Breznički Hum
Ž2171 to Hrašćina and the D24 state road.

17px

| 25px A4 in Breznički Hum interchange to Varaždin (to the north) and to Zagreb (to the south). There is a short connector road serving this interchange.

17px

| Ž2174 to Breznica (the road loops to Breznica and back to the D3 forming two junctions with the latter).

17px

| Ž2175 to Visoko and Sudovec (D22).

| Mirkovec Breznički
Ž2207 to Bisag and Drašković.

25px

| Dubovec Bisaški

25px

| Komin
Ž3002 to Zaistovec, Gregurovec and Križevci (D41).
Ž3001 to Bedenica.

17px

| 25px A4 in Komin interchange to Varaždin (to the north) and to Zagreb (to the south). There is a short connector road serving this interchange.

25px

| Filipovići

25px

| Hrastje
Ž2221 to Donje Orešje and Marija Bistrica (D29).
Ž3015 to Polonje.

25px

| Pretoki

25px

| Sveti Ivan Zelina
Ž3288 to Vrbovec and Dubrava interchange (D10).
Ž3014 to Biškupec Zelinski.

17px

| Ž3013 to Donje Psarjevo and Nespeš.

25px

| Blaževdol

17px

| Ž3016 to Sveta Helena and Rakovec.

25px

| Donja Zelina

17px

| Ž3038 to Bukovec Zelinski.

25px

| Goričica
Ž3039 to Paukovec.

25px

| Blaškovec
Ž3010 to Gornja Drenova.

25px

| Belovar
Ž1006 to Adamovac, Moravče and the D29 state road.

25px

| Žerjavinec

25px

| Soblinec
25px D29 to Marija Bistrica, Zlatar Bistrica and Novi Golubovec (D35).
Ž1014 to Šašinovec.

25px

| Popovec.

17px

| 25px A4 in Popovec interchange to Varaždin (to the north) and to Zagreb (to the south).
The D3 state road and the A4 motorway are concurrent to the south of the interchange.

17px

| 25px Kraljevečki Novaki interchange
Ž3034 to Dugo Selo and Vrbovec 1 interchange (D10).
To Zagreb via Sesvete.
The D3 and the A4 are concurrent at this interchange.

21px

| 25px Ivanja Reka interchange
25px A3 to Slavonski Brod (to the east).
To Zagreb via Slavonska Avenue.
The D3 and the A3 are concurrent between at this interchange and Lučko interchange (to the west).

17px

| 25px Kosnica interchange
25px D31 to Velika Gorica and Gornji Viduševac (D6).
To Zagreb via Radnička Road.
The D3 and the A3 are concurrent at this interchange.

17px

| 25px Buzin interchange
25px D30 to Zagreb and Velika Gorica.
The D3 and the A3 are concurrent at this interchange.

21px

| 25px Lučko interchange
25px A3 to Jankomir interchange and Samobor (to the west).
25px A1 to Karlovac and Split.
25px D1 to Karlovac - The D1 and the D3 are concurrent south of this junction.
To Zagreb via Jadranska Avenue.
The D3 and the A3 are concurrent between at this interchange and Ivanja Reka interchange (to the east).

21px

| Lučko
Ž3064 to Rakitje.

21px

| Gornji Stupnik
Ž3067 to Donji Stupnik.

17px

| Ž3061 to Kalinovica, Brezje Samoborsko and Sveta Nedjelja.

21px

| Rakov Potok

21px

| Klinča Sela
Ž3106 to Kupinec and Pisarovina (D36).

17px

| Ž3105 to Stankovo.

21px

| Jastrebarsko
25px D310 to A1 motorway Jastrebarsko interchange.
Ž3055 to Donja Reka and Samobor

21px

| Novaki Petrovinski
Ž3102 to Draga Svetojanska and Hrastje Plešivičko.
Ž3103 to Domagović.

21px

| Čeglje

17px

| Ž3101 to Guci Draganički and Brezarić.

21px

| Draganić
Ž3150 to Lazina.

21px

| Lug
Ž3146 to Tuškani and Mahično.

17px

| 25px A1 Karlovac interchange to Zagreb (to the north) and to Rijeka, Zadar and Split (to the south). The interchange is accessed via a short connector.

17px

| The northern terminus of dual carriageway expressway through Karlovac.

21px

| Karlovac
25px D1 to Plitvice Lakes National Park and Knin (to the south). The D1 and D3 roads are concurrent to the north of Karlovac.
25px D6 to Netretić (to the west) and to Vojnić, Glina and Dvor (to the east). the D3 and D6 roads are concurrent in a short section in Karlovac.
25px D36 to Pokupsko, Sisak and A3 motorway Popovača interchange.
25px D228 to Ozalj and Jurovski Brod (D6).