Speed limits change quite often in Thera and the whole of Santorini, so always look at the posted signs. Within the city limits, usually 30-50 km/h (18-31 mph) is permitted and 65 km/h (40 mph) is the limit for open roads; however, it is very important to adjust your speed and slow down considerably when the streets narrow or the road is partially obstructed. Search rental cars on KAYAK