1 highway, often combined with the state roads D8 (by the coastline) and D1 (through the hinterland).
To use highways in Croatia you must pay a toll either in Croatian national currency, the Kuna, or in Euro. One may also pay by credit card- American Express, Diners, Master Card, Maestro or Visa cards. A third option is to use the HAC Smart Card, which can reduce the cost of travelling on the Croatian highways by 10-25%. It is issued by Hrvatske Autoceste but pays off only if travelling more than 500 km (that's a return trip Zagreb-Zadar or Zagreb-Serbia) or 250 km for a seasonal Smart Card (a return trip Zagreb-Rijeka or two return trips to Zagreb from Austrian border). You can find a toll calculator here (click Calculator on the left navigation bar).
By bus
The central bus station (Autobusni Kolodvor) is located to the south-east of the railway station - approximately 10 minutes walk, or 3 stops by tram (lines 2 and 6). Timetable information and prices can be found on the AKZ website.
Numerous Croatian and International coach operators maintain scheduled lines covering all major domestic and European cities, as far as London, Paris, Rotterdam and Amsterdam, numerous cities in Germany, Belgium, Switzerland, Italy, Slovakia, Czech Republic, Slovenia, Hungary, many destinations in Bosnia and Herzegovina, Serbia, Montenegro, and Macedonia
