Here's a sincere question for you, Mike Simon...since you brought up driver training etc.
In the USA, some very interesting and peculiar driving habits have developed on a regional or local basis. While I have not been everywhere, here are a few of them of my observation.
1. In OHIO they do not like to drive in the rain. Often on the Ohio turnpike, when it starts raining heavily, flashers come on, and often many drivers simply pull over and stop driving. I've never seen this anywhere else.
2. In PITTSBURGH, at a 4-way stop, the drivers are incredibly courteous taking their turns without issue. Amazing.
3. In PHILADELPHIA, if you are at an intersection red light, waiting to turn left (an intersection without a green left turn arrow) it is EXPECTED of you to "jump the gun" and zoom quickly to make that left hand turn before the oncoming traffic goes straight. If you don't understand that quickly, boy will you ever as people yell expletives at you, honk their horn, or even go around you! Nowhere else have I been where this is expected or allowed...even the Police do it. It's a Philly thing.
4. In VIRGINIA, on interstates, drivers love to hang out in the left hand lane, below the speed limit, completely oblivious to the buildup of traffic behind them. While this rude behavior exists everywhere, and is actually illegal in most places, it's overtly done in Virginia.
5. In MASSACHUSETTS directional signals are not used as often as they should be, but the real danger with generalized Massachusetts driving is nuts. If you are on a main road and there is little traffic ahead of or behind you, and you see a car on a side street waiting to turn on the main road, they will wait until the last possible second to do so...sometimes with disastrous consequences like getting T-BONED if you are not careful enough to know about this.
I'm sure other states and locales have other issues, but these are places I've either lived or spent a lot of time driving in or through and can make those observations.
So my question is: In Germany, do they have any different driving characteristics in say, Hamburg vs. Munich? North vs South? East vs. West? Or is it all pretty uniform?