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| direction_b = South | terminus_b = in Pula | counties = Istria | cities = Buje, Vodnjan, Pula | previous_type = D | previous_route = 20 | next_type = D | next_route = 22 }} D21 is a , north–south state road in Istria County, Croatia. A short section of D21 is a part of the European route E751. The northern terminus of the route is located at the Croatia–Slovenia border at the Dragonja River. There it connects to Koper, Slovenia, and Trieste, Italy, via the Slovene route G11 further north. D21 route is generally parallel to A9 motorway. The two form several junctions, either directly or via short connectors, at Buje, Bale and Vodnjan – towns served directly by D21. The southern terminus of the route is found in the city of Pula, at the southern tip of the Istrian Peninsula. The road, as well as all other state roads in Croatia, is managed and maintained by Hrvatske ceste, a state-owned company. The road carries an annual average daily traffic of about 2,000 vehicles, and the traffic volume increases by up to 1,000 vehicles in summer as the road is used by tourists in the region. The southernmost portion of the road is significantly more congested as it carries Pula suburban traffic. In classical antiquity, the western Istria route was first used by ''Via Flavia'' in the classical antiquity, but the roads in the area declined in the Middle Ages and subsequent division of the Istrian Peninsula by the Republic of Venice and the Habsburg Empire was not conductive to development of a road system. In the 19th century, the First French Empire started road construction, including the Trieste–Pula route now largely followed by D21. The present-day D21 route was a part of M2 Adriatic Highway route after the Second World War. It was made a separate state road and assigned its present route number in 1997. ==Route description== D21 is an state road situated in Istria County following a general north–south alignment. Most of the route runs through predominantly agricultural land and small settlements, except the route segment between Bale and Baderna, where the road is predominantly surrounded by forests. The southernmost of the route runs through suburbs of Pula – the largest city in the region. D21 extends south from the Kaštel border crossing between Croatia and Slovenia situated at the Dragonja River.〔 To the north of the D21 terminus, the route – a part of the European route E751 – connects the cities of Koper, Slovenia, and Trieste, Italy, via G11 in Slovenia. The first section of the D21 route follows an overall eastern orientation. About away from the borderline, it reaches the Kaštel border crossing, and after , there is an at-grade intersection where the traffic defaults to D510, which serves as a connector to the A9 motorway. D21 itself turns southwest towards the village of Kaštel, approximately away. Just to the north of Kaštel, D21 turns south before proceeding to the city of Buje located about down the road from Kaštel. In Buje, D21 forms at-grade intersections with D200 and D300. D200 provides a route to the Plovanija border crossing with Slovenia and D300 to the town of Umag and Umag interchange of A9 motorway. There are also at-grade intersections with the county roads Ž5007 and Ž5008 in the city. South of Buje, the route turns southeast across hilly terrain until it reaches Ponte Porton in the Mirna River valley approximately away from Buje. There D21 forms a roundabout junction at the north bank of the river. The roundabout connects D21 to D44, which links the town of Buzet and D301 to Novigrad and another A9 interchange.〔 After the route crosses the Mirna River, it continues about southeast to Vižinada, where D21 forms an intersection with Ž5041 road to Brnobići village. In Vižinada, the route turns south once more as it reaches the Ž5042 intersection connecting Višnjan after another , and the village of Baderna south of the Mirna River crossing. At Baderna, D21 connects with D302 extending to Poreč and the A9 motorway, located west of the road junction, as well as D48 leading to Pazin east of D21. The intersection is built as a partial cloverleaf interchange.〔 Approximately south of Baderna, the route reaches the village of Sveti Lovreč and proceeds due south to the Medaki interchange of the A9 – another partial cloverleaf interchange – about south of Sveti Lovreč. D21 turns southwest at the Lim embayment of the Adriatic Sea after another . At that point, D21 forms an at-grade intersection with Ž5002 road to Vrsar situated further west. Following the Ž5002 junction, D21 turns southeast to follow the contours of the Lim embayment valley. After approximately , the route reaches a grade separated intersection, a two-ramp partial cloverleaf, with D303. D303, in turn, links to the Kanfanar interchange of the A9 motorway and the coastal city of Rovinj.〔 South of the D303 intersection, D21 runs south along a generally flat terrain and consists of relatively straight sections compared to the northern parts of the route. About south of the D303 junction, D21 forms an at-grade intersection with Ž5098 to Svetvinčenat. from there, D21 enters the town of Bale and intersects the Ž5095 road linking Rovinj. South of Bale, D21 turns southeast and approaches Vodnjan. It reaches a short connector to the Vodnjan-sjever (north) interchange of the A9 motorway down the road.〔 After another , D21 reaches the city of Vodnjan and the Ž5192 road junction connecting to Fažana. There are two further significant junctions of D21 in the next – one with Ž5190 to Svetvinčenat and the other with the Vodnjan-jug (south) interchange of A9. South of Vodnjan, D21 route proceeds another due south to reach Ž5117 connecting the village of Galižana, and reaches outskirts of Pula after another . Within Pula, D21 route forms an at-grade junction with the Ž5115 road to Fažana about further along. The junction also serves the Brijuni National Park. The southern terminus of the route is found at a roundabout further south, where D21 connects to D400.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「D21 road (Croatia)」の詳細全文を読む スポンサード リンク
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