German drivers are boring but awesome... They will stick doggedly to the posted speed limit in perfect formation, until that speed zone ends, and then *ʞ©$ɟenwhoosh* everyone mashes the pedal and goes to warp speed.
Oh and there's a 'bahn hierarchy too. Trucks on the right. Always. Everyone else in the middle lane unless overtaking. (and unlike here, people actually adhere to that rule)
The big sedans and coupes OWN the left lane. Do not dawdle in the left lane. You're likely to encounter a V12 7-series or S-Klasse bearing down on your arse at Mach 3, headlights flashing.
Mercedes rules the road. Some things haven't changed since the Third Reich...
As for Italy... I LOVED driving in Italy. Everyone is insane and/or impatient. Utter chaos. And yet, it still seems to work. Rule of thumb: Just floor it, point the wheels in the direction you want to go, and hope. The scooters are pretty good at dodging you.
French drivers are like Italians, except they're shit at it. Just... Hopeless.