I live in Germany and regularly travel to neighbouring countries by car. The lack of speed limits on some sections of the German Autobahn makes traveling through that country seriously exhausting. While you just keep on keeping on on non-German highways driving on a German Autobahn section without tempo limit can feel like entering a war.

The typical makeup of a three-lane section of German Autobahn is:

- Right: trucks, very slow vehicles - Middle: people who go at reasonable speeds (~130 to 160 km/h depending on the terrain) - Left: people who disregard the physics of air resistance and blast without limits

This is the ideal, but not what you will encounter on the road. Whenever a truck overtakes another you have to beeak down or use the leftmost lane and make sure the cars that approach from behind with a potential delta of 100+ km/h don't crush you to death. Generally this leads to many stressful and dangerous situations.

Speed limits make sense because they make driving safer by deceeasing the possible speed delta between vehicles who share a road.