Zürich just had a critical mass with 10K+ riders, police reports the pulk to have been 4km long at times and car traffic collapsed for 30-45 minutes.
Zürich has, despite a dozen public votes demanding bikling infrastructure and a lefty.green government for 30 years, still the worst cycling infrastructure in all of Switzerland, this is why cyclists put the pressure on the streets now.
https://www.youtube.com/watch?v=WQ0xgq501lk 