You want to leave the motorway. What is the right course of action?

You answered correctly. When leaving the motorway in Germany, you should begin reducing your speed before reaching the exit lane, not only once you are already at the turn. It's also important to monitor your speed closely using the speedometer, because the speed differences between the motorway and the exit ramp are often significant. This helps you adjust smoothly and safely to the lower speed limits that usually apply on exit lanes. Reducing speed early and checking your speed regularly keeps you and other drivers safe during the exit process. Avoid braking suddenly at the last moment, as this can endanger other traffic.