I remember there was a test run Australia and no speed limit didn't increase casualties.

Whenever I come over to Germany, driving on autobans feels like a pleasure compared to eastern european highways with a speed limit :/

Yes, but Germany compensates with good traffic rules and good driver education (one of the harder to get driving licenses around the world, with 18 hours of mandatory theoretical classes, practical classes, and theoretical and practical tests that cost you around €2000 overall). Going by [1] Germany has the 15th lowest per-capita traffic-related death rate, less than one third that of the USA.

1: https://en.wikipedia.org/wiki/List_of_countries_by_traffic-r...