By Road
The best way to move in Croatia is probably by Road. The quality of the roads and the freeways is good. one must pay attention to the bora along the coast, that can annoy the guides. The coastal road is also very twisted, but certainly spectacular. The speed limits are of 130 km/h on the freeways, 100 km/h on two lane roads, 80 km/h outside the cities and 50 km/h in city.If you want to rent a car, you must be more than 23 years. In Croatia the main companies of car rental are present.

By Auto
Also the buses are the the best transport mode. They allow to reachup to the smaller locations and the coastal ones. The Autotrans takes many passages whether along the coast, or in the mainland. Its site is:
Autotrans (in English) www.autotrans.hr

The Autobusni Promet connects the inland with Istria. Its site is:
Autobusni Promet d.d. (in English) www.ap.hr

By Train
The train, instead, is not more economical than the bus and, above all, it does not reach the Dalmatia and a good part of Istria. The ferries connect the coast with the various islands and the islands between them. The main company is the Jadrolinija. Its site is:
Jadrolinija (in English) www.jadrolinija.hr