I would agree with you if your argument was that a road, such as a desert road, or a multiple lane highway similar to the Autobahn, should not have speed limits. But no speed limits anywhere is not reasonable. I have no idea where you are getting your information from, but there are speed limits in Germany (everywhere but the autobahn and major freeways; which were specifically designed for high speeds).
General speed limits in Germany are set by the federal government. All limits are multiples of 10 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. On the German primary road network, the autobahns, there is no general speed limit. Parts of the autobahns and many other freeway-style highways have a posted limits of usually 130 km/h (81 mph). Generally the driver may drive only as fast as one has always full control over the vehicle
The speed limits are enforced with a small tolearance. Driving merely 3 km/h (2 mph) or faster above the posted or implied speed limit is considered a punishable infraction in Germany. The speeding fines are set by federal law (Bußgeldkatalog, fee catalog).
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