A German motorway without traffic is very easy to navigate, but a typical day to day situation involves several kinds of cars driving at different speed limits

A German motorway without traffic is very easy to navigate, but a typical day to day situation involves several kinds of cars driving at different speed limits and engaging in various maneuvers like overtaking, exiting, merging, switching lanes. There's also traffic jams or heavy traffic situations. If one wants to drive dynamically, one has to overtake and switch lanes quite a lot, which makes this challenging. If one is content with driving like a snail they can stick to the first lane, which is pretty simple and could be managed even by a so-called self-driving car.