In Italy several cities lowered the maximum speed from 50 to 30 km/h.

There was a huge fight over it, car drivers in those cities were mad. Plenty of politicians opposed it.

One year later stats were super clear: streets got way safer and the number of fatal accidents dropped to near 0. Time to traverse cities didn't change much, as it was already limited mostly by traffic and lights.

Yes, agreed. Though speed limits higher than 75 are not something I will ever support.*

* Unless we're talking about removing a speed limit altogether and regulating unsafe driving using other criteria.