19 of the Best Coastal Drives in the World. D512 state road, Croatia D512 state road is one of the most beautiful roads on the Adriatic coastline of Croatia. The road is 30.6 km (19.0 mi) long and carries substantial tourist traffic in summers. This narrow, winding hill road starts in Makarska, one of the best tourist destinations on the Croatian coast and ends in the Road 62 near Vrgorac, a town in the Split-Dalmatia County.