German autobahn generally (highway) has no speed limit, you can literally drive as fast as your car allows you to drive.
The left lane is ONLY for faster driving cars aka drivers passing others,it is Illegal to use the left lane for basic driving.
Passing from the right lane is also Illegal...Germany and the drivers are also very very strict about it,meaning - everyone follows that rule,for safty reason. With that speed,you can not effort to drive left and right and what not...everyone knows : left lane for speeders and to pass others Only ,right lane for regular drivers. Also truck drivers and busses are not allowed to use the left lane,unless they are passing a slower vehicle.
Also in Germany most exist ramps to get out of the highway,are to your right, also the exits to enter the highway are very long,meaning time to speed up and get in line with the other cars driving.
Some cities,areas even states,have speed limits (120km/h) its usually on and off....
you might have for 5 miles no speed limit,and after that u might get a sign saying speed limit 120km/h
And also, german traffic signs are superior to most others, meaning if the speed limit changes on the autobahn in germany the sign will actually tell you "limit 120km/h after 2000m then u'll see another sign saying 120km/h after 1000m " so u are prepared to slow down.
Signs in germany are never sudden and very well managed. Alot of them are digital even.
Also every 3 miles on german highways,there is an emergency phone,in case your car breaks down...literally every single highway,has ever 3 miles an emergency phone on the shoulder,which is colored in orange.
On regular roads however the speed limit and enforcment is very strict.
The allowed alcohol level is 0.5 in germany, for new drivers aka beginers its 0.0 for 2 years,meaning u can not have nothing.
In germany,when you get your drivers license,you start with 2 year probabation,meaning,you have to drive safe and secure without any heavy incidents for 2 years,otherwise u could lose your license or have to re-take the test.
German drivers license cost usually 1200 euros almost 2000 bucks.
And a german drivers license,never expires and never needs to be renewed. Because its a drivers license,only not an ID!
About the cars, germany has a inspection law,every 2 years,cars need to go through a very strict inspection called "TuV" before they give you new tags for your car.
One of the main secure things is, under that TUV law,a car in germany is not allowed to have any kind of rust,if it doesmu won't be allowed to drive it or get new tags,unless its being fixed.They check breaks,they check your lights etc etc.
Its also the law in germany,that every car owner has to have an emergency kit in the vehicle.
The only funny part about this is " cops never check mercedes owners car, because Mercedes used to be the only car that came with a factory stock emergency kit in the trunk
Hope this little info was informative how things are in germany