Speed limits in Frankfurt proper are typically set to the base speed limit of 50 km/h (31 mph), while outside the city it jumps up to 100 km/h (62 mph). Speed limits are strictly enforced and even driving 3 km/h over the limit can make you liable for a fine. Aside from those two baseline limits, speed limits are assigned on a street-by-street basis and can change variably. Search rental cars on KAYAK