General speed limits in Germany are set by the federal government. All limits are multiples of 5 km/h. There are two default speed limits: 50 km/h (31 mph) inside built-up areas and 100 km/h (62 mph) outside built-up areas. While parts of the autobahns and many other freeway-style highways have a posted limits up to 130 km/h (81 mph) based on accident experience, congestion and other facts, many rural sections have no general speed limit. The German Highway Code (StraÃYenverkehrs-Ordnung) section on speed begins with the requirement which may be rendered in English:
Any person driving a vehicle may only drive so fast that the car is under control. Speeds must be adapted to the road, traffic, visibility and weather conditions as well as the personal skills and characteristics of the vehicle and load.
This requirement applies to all roads, and is similar to the "reasonable speed" legal obligation levied in other nations.
Speed limits are enforced with a small tolerance. Driving merely 3 km/h (2 mph) or faster above the posted or implied speed limit is considered a punishable infraction in Germany.
I'll take the American approach any day.
"Protozoa are small, and bacteria are small, but viruses are smaller than the both put together."