Part of an event called Sternfahrt where cyclists protest for policy changes by taking over the city on 20 routes covering 2000 km of public roads.
some infos in german: https://berlin.adfc.de/pressemitteilung/adfc-sternfahrt-medienkit
translation to english: https://berlin-adfc-de.translate.goog/pressemitteilung/adfc-sternfahrt-medienkit?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp
Yeah it was nice. I didn’t do the highway route because the kid wanted the child-friendly part, but still it was really nice to see so many people in the streets.
There were people coming from other cities as well, riding the whole night to get to Berlin on Sunday. Love it.
By the way, 32k sounds a lot, but in its heyday there were 200k people riding around. Even last year with 50k crowd it was completely different feeling, the inner city almost without cars.