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The ADAC is certainly representative, because that’s just people using cars. People that do not use cars and are not affected by a speed limit (e.g. people living in larger cities) are irrelevant.
Also you did 0 research and consolidated 0 resources for your claims:
https://de.wikipedia.org/wiki/Zulässige_Höchstgeschwindigkeit_im_Straßenverkehr_(Deutschland)#Umfragen_und_Verbände
There is a very slight majority in the recent years depending on the height of the limit. But certainly not for decades…
Your Wikipedia reference does not support your claim that there hasn’t been a majority for decades. It only lists surveys from the last few years. But that does not mean that there weren’t majorities before that.
ADAC members are people who joined the motorist organization, it’s not just people driving cars.
If you think that the opinion of the general population does not matter, fine. But the ADAC members still do not represent the general population.