Motorways connect Zagreb to Slavonia and Zagreb to Istria via Rijeka. Another major motorway heads from Zagreb to Dalmatia, with turn-offs for Zadar, Šibenik and Split; it continues in the direction of Dubrovnik, but falls short by 110km. Although the roads are in excellent condition, there are stretches where service stations and facilities are scarce.
The Hrvatski Autoklub offers help, advice and a nationwide roadside-assistance number.
Car hire is available in all major towns, airports and tourist locations. Independent local companies are often much cheaper than the international chains, but the big companies offer one-way rentals. Sometimes you can get a lower rate by booking the car from abroad, or by booking a fly-drive package.
In order to rent a car you must be 18, have a valid driving licence and have a major credit card to cover the insurance excess.
Third-party public-liability insurance is included by law with car rentals. If it's not covered by your travel-insurance policy, make sure your quoted price includes full collision insurance, known as a collision damage waiver (CDW).
Any valid driving licence (no matter what its language) is sufficient to drive legally and rent a car; an international driving licence is not necessary.