There is the Radschnellweg Ruhr (Bike Fastlane Ruhr) it’s (a planned total of) 115km of freestanding bike lanes (17km in parts has been created already).
Source (Sorry it’s only German, translate with service of your choice.) https://de.wikipedia.org/wiki/Radschnellweg_Ruhr_(RS1)
There is the Radschnellweg Ruhr (Bike Fastlane Ruhr) it’s (a planned total of) 115km of freestanding bike lanes (17km in parts has been created already). Source (Sorry it’s only German, translate with service of your choice.) https://de.wikipedia.org/wiki/Radschnellweg_Ruhr_(RS1)