As with most 'western' countries, it varies.
"geschwindigkeitsbegrenzung"
The German Autobahn speed limit map provides information on the specific speed limits that drivers must adhere to on different sections of the Autobahn highway system. This helps drivers to know the maximum speed they are allowed to travel at in different areas, ensuring safe and legal driving.
826 limit
The German speed limit sign plays a significant role in regulating traffic on the autobahn by setting specific speed restrictions for drivers. This helps to ensure safety on the road and prevent accidents by controlling the speed at which vehicles can travel. The sign helps to maintain order and reduce the risk of collisions, making the autobahn a safer and more efficient highway system.
the posted speed limit
When another speed limit sign is reached that changes the limit from the previously posted one.
The speed limit in the fast lane is the same as the speed limit for the road or highway you are driving on.
The speed limit is exactly that - the speed limit. While a reasonable excess of speed might be overlooked when overtaking another vehicle, there is no guarantee. You can be pulled over and cited for speeding, still.
The posted speed limit is the max speed.
In the UK the speed limit comes into force as soon as you pass the speed limit sign. As such the distance is zero as you should have slowed down to the posted speed limit before passing the sign.
The humps do not affect the speed limit. The speed limit is determined by other rules and signs.
Whatever the posted speed limit is.