What is the right thing to do in this situation?

In this situation, you are approaching a slow-moving tractor on a narrow rural road. The correct action is to be prepared to stop if necessary, especially since there may not be enough room to pass safely or the tractor might make an unexpected maneuver, like turning onto a field. You are not required to drive onto the field yourself, nor do you automatically have priority over the tractor; instead, you must adapt your driving and stop if the situation requires it. This is in line with the general German traffic rule that safety and caution come first, especially on narrow country roads behind slow vehicles. Always be ready to slow down or stop and never assume you have priority if that could endanger anyone.