http://www.amcham.de/services/drivers-license/us-citizens-in...
I noticed a fair number of "bad" (by German standards) drivers on the southern Autobahnen over the past few weeks, but they were mainly non-Germans; I'm 99% sure the drunk guys in the 15 year old Honda were US military, and by the plates, most of the other bad drivers were also not German. So it's not foolproof, but still the standard is far higher, and the roads are well maintained.
What I noticed most acutely was the lack of objects-in-road, vs. California. Not sure if that's due to the general lack of pickup trucks, people hauling junk, etc., or due to laws/training/maintenance.
Roadside trash sucks, too, for different reasons.
(I call 911/CHP to report this stuff frequently, on average once a week or more. They send a CHP car or two out to road-break and remove it, or CHP+Caltrans if it's big.)
It is amusing that the US military is in some ways the most highly regulated and the most European-like in their regulations, due to the fact that commanders have broad authority and the services provide universal health care and housing for enlisted men and their families. They have good incentives to establish standards of vehicle safety.
IIRC, more junior enlisted Marines were dying from motorcycle accidents, per capita, back at their home bases (it might have been specific to San Diego), than in combat in Fallujah.
(OTOH, they went overboard with things like the PT belts...)
The priority road concept, with unmarked intersections, is one that wouldn't work all that well in the US.
Inside cities/towns, the limits are often both strictly enforced and dynamic. That is: they change with traffic conditions and are signaled via electronic signboards.
Germany also has some horrific auto accidents, though the death rate per 100k population/yr. is less than half that of the US, at 4.4 vs. 10.4.
https://en.wikipedia.org/wiki/List_of_countries_by_traffic-r...