D21 (Croatia)
Encyclopedia
D21 is a state road connecting the Kaštel
Kaštel
Kaštel is a village in Croatia, located on the border with Slovenia. It is connected by the D21 highway....

 border crossing and Buje
Buje
Buje is a town situated in Istria, Croatia's westernmost peninsula, population 2,979 .Buje was known as the "sentinel of Istria" for its hilltop site located inland from the Adriatic sea. It still commands an excellent panorama. Buje has a rich history; traces of life in the region date back to...

, as well as A9 motorway via D510 state road
D510 (Croatia)
D510 is a state road connecting D200 near Plovanija border crossing and D21 near Kaštel border crossing, as a part of a series of short roads connecting Kaštel border crossing and A9 motorway Umag interchange...

. The road is 80.1 km (49.8 mi) long.

The road provides connections to several towns and cities in central and western Istria
Istria
Istria , formerly Histria , is the largest peninsula in the Adriatic Sea. The peninsula is located at the head of the Adriatic between the Gulf of Trieste and the Bay of Kvarner...

, most notably to Grožnjan
Grožnjan
Grožnjan is a settlement and municipality in Croatia. It is part of Croatia's Istria County, which takes up most of the Istria peninsula. It is also the only place in Croatia to have an Italian majority.-Early history:...

, Svetvinčenat
Svetvincenat
Svetvinčenat is a village and municipality in the south of the central part of Istria, Croatia, 16 km north of Vodnjan; elevation 250 m. Svetvinčenat was first mentioned around AD 965, when the town began to grow around a Benedictine abbey. The economy is based on farming and livestock...

 and Pazin
Pazin
Pazin is the administrative seat of Istria County in Croatia. The town has a population of 4,986 , the total Pazin municipality population is 9,227...

 via roads connecting to D21.

Prior to construction of the A9 motorway, D21 was the main north-south road in the western Istria, and it was heavily congested in summer due to heavy tourist traffic and the fact that it served as the main connection for regular traffic in the area, passing through many settlements. Now it serves as a parallel road to the A9 motorway, as it is linked to virtually every interchange of the motorway by connecting roads of varying length, most notably D510
D510 (Croatia)
D510 is a state road connecting D200 near Plovanija border crossing and D21 near Kaštel border crossing, as a part of a series of short roads connecting Kaštel border crossing and A9 motorway Umag interchange...

, D200
D200 (Croatia)
D200 is a state road connecting Plovanija border crossing and Buje, as well as A9 motorway Umag interchange via Ž5002 county road. The road is 7.6 km long.The road also provides a connection to Kaštel border crossing via D510 and D21 state roads....

 and Ž5002 which serve, along the D21 state road, as the main connection of the A9 motorway and Slovenian
Slovenia
Slovenia , officially the Republic of Slovenia , is a country in Central and Southeastern Europe touching the Alps and bordering the Mediterranean. Slovenia borders Italy to the west, Croatia to the south and east, Hungary to the northeast, and Austria to the north, and also has a small portion of...

 road network - to route 11 and then towards H5 expressway to Koper, Slovenia
Slovenia
Slovenia , officially the Republic of Slovenia , is a country in Central and Southeastern Europe touching the Alps and bordering the Mediterranean. Slovenia borders Italy to the west, Croatia to the south and east, Hungary to the northeast, and Austria to the north, and also has a small portion of...

 and Trieste
Trieste
Trieste is a city and seaport in northeastern Italy. It is situated towards the end of a narrow strip of land lying between the Adriatic Sea and Italy's border with Slovenia, which lies almost immediately south and east of the city...

, Italy
Italy
Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

.

The road, as well as all other state roads in Croatia, is managed and maintained by Hrvatske ceste
Hrvatske ceste
Hrvatske ceste is a Croatian state-owned company pursuant to provisions of the Croatian Public Roads Act , the county and local roads are managed by county authorities, while the motorways are managed by Croatian Motorways Ltd and other concessionaires.The company is currently administered by a...

, a state-owned company.

Traffic volume

Traffic is regularly counted and reported by Hrvatske ceste
Hrvatske ceste
Hrvatske ceste is a Croatian state-owned company pursuant to provisions of the Croatian Public Roads Act , the county and local roads are managed by county authorities, while the motorways are managed by Croatian Motorways Ltd and other concessionaires.The company is currently administered by a...

, operator of the road. Substantial variations between annual (AADT) and summer (ASDT) traffic volumes are attributed to the fact that the road connects a number of summer resorts to the Croatian motorway network.
D21 traffic volume
Road Counting site AADT ASDT Notes
D21 2702 Kaštel 1,807 2,805 Adjacent to Kaštel border crossing.
2707 Sveti Ivan 2,420 3,264 Adjacent to Ž5008 junction.
2719 Vižinada north 1,644 2,847 Between D44
D44 (Croatia)
D44 is a state road connecting D21 state road south of Buje to A8 expressway via Buzet. The road is long.The road also provides connections to numerous towns and cities in central Istria, most notably to Lupoglav, Buzet, Motovun either directly or via numerous roads connecting to D44...

 and Ž5041 junctions.
2721 Baderna north 2,015 3,009 Adjacent to D48
D48 (Croatia)
D48 is a state road connecting the city of Pazin with D21 and D302 state roads near Baderna, the latter serving as a connecting road to A9/B9 expressway....

 junction.
2717 Bale 2,320 2,783 Between Ž5098 and Ž5096 junctions.
3905 Pula north 7,136 9,464 Between Ž5115 and Ž5117 junctions.
The site effectively counts traffic between D21 and D400
D400 (Croatia)
D400 is a state road connecting D66 and D21 state roads to Pula city centre and Pula ferry port. The road is only long. Urban planning documents of the city of Pula, indicate that the road may be expanded from its current two traffic lanes to four....

.

Major intersections

Listed settlements with no specified junctions contain intersections with non-categorized roads.
All intersections are located in Istria County
Istria County
Istria County is the westernmost county of Croatia which includes the biggest part of the Istrian peninsula . The area of the county is called Istra in Croatian and Slovene...

, Croatia
Croatia
Croatia , officially the Republic of Croatia , is a unitary democratic parliamentary republic in Europe at the crossroads of the Mitteleuropa, the Balkans, and the Mediterranean. Its capital and largest city is Zagreb. The country is divided into 20 counties and the city of Zagreb. Croatia covers ...

.
{| class="wikitable"
|-
!scope="col"|km
!scope="col"|Location
!scope="col"|Junction
!scope="col"|Notes
|-
| bgcolor=ddffdd|0
| bgcolor=ddffdd|Kaštel border crossing
| bgcolor=ddffdd| G11
| bgcolor=ddffdd|Kaštel border crossing to Slovenia
Slovenia
Slovenia , officially the Republic of Slovenia , is a country in Central and Southeastern Europe touching the Alps and bordering the Mediterranean. Slovenia borders Italy to the west, Croatia to the south and east, Hungary to the northeast, and Austria to the north, and also has a small portion of...

.
Northern terminus of the road and of the European route E751
European route E751
The European route E751, or E751, as defined by the Declaration on the Construction of Main International Traffic Arteries of 1975, and subsequent documents which amended the treaty, is an east-west Class-B branching European road route...

; Northbound D21 traffic defaults to Slovenian G11 road
|-
| bgcolor=ddffdd|1
| bgcolor=ddffdd|
| bgcolor=ddffdd|

| bgcolor=ddffdd|Connection to A9 motorway Umag interchange and to Plovanija
Plovanija
Plovanija is a village in Croatia, near the border with Slovenia. It is connected by the D200 highway....

 border crossing to Slovenia
Slovenia
Slovenia , officially the Republic of Slovenia , is a country in Central and Southeastern Europe touching the Alps and bordering the Mediterranean. Slovenia borders Italy to the west, Croatia to the south and east, Hungary to the northeast, and Austria to the north, and also has a small portion of...

 (via D200 state road
D200 (Croatia)
D200 is a state road connecting Plovanija border crossing and Buje, as well as A9 motorway Umag interchange via Ž5002 county road. The road is 7.6 km long.The road also provides a connection to Kaštel border crossing via D510 and D21 state roads....

); The D21 and the E751 north of the intersection are concurrent
Concurrency (road)
A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different highway, motorway, or other route numbers...


|-
| 3
| Kaštel
Kaštel
Kaštel is a village in Croatia, located on the border with Slovenia. It is connected by the D21 highway....


|
|
|-
| rowspan=4| 5-6
| rowspan=4| Buje
Buje
Buje is a town situated in Istria, Croatia's westernmost peninsula, population 2,979 .Buje was known as the "sentinel of Istria" for its hilltop site located inland from the Adriatic sea. It still commands an excellent panorama. Buje has a rich history; traces of life in the region date back to...


|
| To Plovanija border crossing
|-
|
| To A9 motorway and Umag
Umag
Umag is a coastal city in Istria, Croatia.The city hosts the yearly Croatia Open ATP tennis tournament on clay courts.-Geography:It is the westernmost city of Croatia, and the municipality includes Savudrija which is westernmost point of Croatia....


|-
|
| To Šterna, Oprtalj
Oprtalj
Oprtalj is a village and municipality in Istria, Croatia. Oprtalj is a community in central northern part of Istrian County situated across the Mirna river valley of the much more celebrated city of Motovun, about 20 km northwest of Pazin....

 and Karojba
Karojba
Karojba is a village and municipality in Istria, Croatia located 18 km north-west of Pazin. The population is 1,489 .-External links:**...


|-
|
| To Grožnjan
Grožnjan
Grožnjan is a settlement and municipality in Croatia. It is part of Croatia's Istria County, which takes up most of the Istria peninsula. It is also the only place in Croatia to have an Italian majority.-Early history:...


|-
| 15
| Bijele Zemlje
|
|
|-
| rowspan =2| 18
| rowspan =2| Ponte Porton
|
| To Buzet
Buzet
Buzet is a town in Istria, Croatia, population 6,059 . Already at the time of Venetian rule, Buzet supplied military stations and the local population with potable water. Today the region of Buze-stina is the central area of the future Native Park of Istria...


|-
|
| To A9 motorway Novigrad interchange and Novigrad
|-
| 23
| Vižinada
Vižinada
Vižinada is a village and municipality in the interior of the western part of Istria, Croatia, 17 km northeast of Poreč; elevation 40 m. Economy is based on agriculture. The parish was first mentioned in 1177, in the papal document granting a privilege to the bishop of Poreč...


|
| To Brnobići
|-
| 26
| Ferenci
|
|
|-
| 31
| Žužići
| nowrap=yes|
| To Višnjan
Višnjan
Višnjan is a village and municipality in Istria, Croatia. Višnjan is the site of Višnjan Observatory . The observatory is home of several long-running international summer programs for youth in astronomy, archeology, marine biology and other disciplines.-Geography:Višnjan is located 12 kilometers...


|-
| 34
| Cvitani
|
|
|-
| rowspan=2| 38
| rowspan=2| Baderna
Baderna
Baderna is a village in Istria region of Croatia. The settlement is administered as a part of the City of Poreč and the Istria County. According to the 2001 census, the village has 201 inhabitants. It is connected by the D21 road....


|
| To Pazin
Pazin
Pazin is the administrative seat of Istria County in Croatia. The town has a population of 4,986 , the total Pazin municipality population is 9,227...


|-
|
| To A9 motorway Baderna interchange and Poreč
Porec
Poreč is a town and municipality on the western coast of the Istrian peninsula, in Istria County, Croatia. Its major landmark is the 6th century Euphrasian Basilica, a UNESCO World Heritage Site since 1997....

.
|-
| 45
| Medaki interchange
|

| Connection to the A9 motorway (E751)
|-
| 47
|
|
| To Vrsar
Vrsar
Vrsar is a village in Istria, Croatia.Today, Vrsar is a tourist resort. Vrsar is situated close to a large archipelago with 18 unpopulated islets covered with Mediterranean plants....


|-
| 52
|
|
| To A9 motorway and Rovinj
Rovinj
Rovinj is a city in Croatia situated on the north Adriatic Sea with a population of 13,562 . It is located on the western coast of the Istrian peninsula and is a popular tourist resort and an active fishing port...


|-
| 58
|
|
| To Krmed and Svetvinčenat
Svetvincenat
Svetvinčenat is a village and municipality in the south of the central part of Istria, Croatia, 16 km north of Vodnjan; elevation 250 m. Svetvinčenat was first mentioned around AD 965, when the town began to grow around a Benedictine abbey. The economy is based on farming and livestock...

.
|-
| 60
| Bale
|
| To Rovinj
Rovinj
Rovinj is a city in Croatia situated on the north Adriatic Sea with a population of 13,562 . It is located on the western coast of the Istrian peninsula and is a popular tourist resort and an active fishing port...


|-
| 69
|
|

| The A9 at Vodnjan sjever (north) interchange, accessed via a short connecting road
|-
| nowrap=yes| 70-72
| Vodnjan
Vodnjan
-Geography:Vodnjan is situated 10 km north of Pula, on elevation of 135 m. It is located at the intersection of the main road Buje - Pula and the regional road Vodnjan - Fažana, as well as on the railroad Divača - Pula.-Demographics:...


|
|
|-
| 73
|
|

| The A9 at Vodnjan jug (south) interchange, accessed via a short connecting road
|-
| 75
|
|
| To Galižana
Galižana
Galižana is a village in Croatia....


|-
| 76
|
|
| To Fažana
Fažana
Fažana is a village and a municipality in Istria, Croatia, a small port and fishermen's centre in the south-western part of the western Istrian coast in the Fažana Strait, 8 km northwest of Pula. It is located on a low part of the coast, well protected from the sea by Brijuni - Brioni Islands...

, Barbariga
Barbariga, Croatia
Barbariga is a tourist village on the south-western coast of Istria, Croatia, on the Barbariga peninsula or Punta Cissana . It is located 22 km northwest of Pula, northwest of Fažana and Vodnjan and southwest of Bale. Chief occupations include farming , fishing and tourism...

 and Brijuni
Brijuni
The Brijuni or the Brijuni Islands are a group of fourteen small islands in the Croatian part of the northern Adriatic Sea, separated from the west coast of the Istrian peninsula by the narrow Fažana Strait...

 National Park (access by boat)
|-
| 77-80
| Pula
Pula
Pula is the largest city in Istria County, Croatia, situated at the southern tip of the Istria peninsula, with a population of 62,080 .Like the rest of the region, it is known for its mild climate, smooth sea, and unspoiled nature. The city has a long tradition of winemaking, fishing,...


|
| To A9 motorway Pula interchange, D66 state road
D66 (Croatia)
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 Ičići, as well as to Brestova ferry port, from which Jadrolinija ferries fly to...

, Pula Airport
Pula Airport
Pula Airport is the airport serving Pula, Croatia, and is located 6 km from the city centre. Thanks to favourable climatic and technical conditions Pula is designated as the alternative airport for parts of Slovenia, Italy, and even Austria...

and Pula ferry port
Southern terminus of the road
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