Overtaking maneuvers are dangerous even on straight and open roads. This is especially true if oncoming traffic approaches you. The speed of oncoming vehicles is difficult to assess. Often the duration of the overtaking maneuver is underestimated. If you take too long, dangerous situations for you and for others can arise. Before you start overtaking another vehicle, make sure that the opposite lane is clear and you can finish the overtaking maneuver quickly. Otherwise you wait.