No motorist is allowed to pass on the right on the Autobahn. Period. This is not an option or a formality. In order for faster moving traffic to be able to pass, slower moving traffic is expected to stay in the right lane. For motorists who are going to pass another vehicle, remember to do so as quickly--if not more so--as you would on an American highway.
There is also no option for stopping or engaging in U-turns on the Autobahn. If your vehicle runs out of gas, the no-stopping-law will still apply to you when on the Autobahn.
As with American highways, any traffic coming on to the Autobahn has to yield to the traffic that's already there. What's different, however, is that during a traffic jam, vehicles in the left lane are mandated by law to move all the way to the left, while vehicles in the center or right lane are mandated to move all the way to the right. The purpose of doing this is to create enough space for emergency vehicles to get through.
Regarding accidents and breakdowns, if a motorist experiences either of these situations, he must pull to the side of the road (if possible) and warn oncoming motorists of the situation by placing a warning sign 200 feet behind the car.
If you find yourself at the tail end of a traffic jam while on the Autobahn, it is generally considered good manners to turn on your hazard lights to warn the motorists behind you.
Flashing your high beams or left turn signal to get motorists ahead of you out of the left lane so you can pass them is of dubious legality. Given the questionable legal nature of doing so, it's best to avoid using this method for passing altogether.
