Greece, Driving in Highways
There are highways in Greece, that link Athens to Thesaloniki, Athens to Patras and some other roads, but the bulk is paved two lane highways that link various cities. Since Greece is mainly a mountainous country (Read more about Greek Mountains), the roads are windy, twisty and need carefull drivers.
In Athens there is pollution control which alternates cars depending on whether their number plate is odd or even. Diesel private cars are not allowed in Greece because diesel particulates destroy the ancient monuments. Foreign cars are currently excempt from this rule however (if you drive a diesel in Athens, think about this).
Driving in Greece
Driving in Greece is one the right and the laws conform to the ones of continental Europe. In order to drive you need to have with you a EU driving license or an International driving permit. Driving in Greece is not very difficult, if you are used to the Mediterranean way. Parking in Greece is a headache specially during the morning hours. Most of the road signs in Greece are both in English and Greek language. The speed limit for cars in residential areas is 40 km/h (25 mph), on Avenues 80 km/h (50 mph) and on highways 120 km/h (75 mph). Seatbelts when you drive in Greece are compulsory by law for all passengers.
Usegul links about Driving in Greece: