The European Union allow its constituent nations to set their own speed limits.
Germany
Germany has the Autobahn there is no speed limit on the Autobahn. It is Germany's version of a freeway.
826 limit
In France the u can reach as high as 130mph and in great Britain u can reach 80mph In France the limit in 120mph UK its 110mph In France the limit in 120mph UK its 110mph The speed limit in the UK is not 80mph, it is 70mph Immature.
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.