The vehicles ahead of you are driving at about 30 km/h. Why are you not permitted to overtake before the road bend?

You answered correctly: You are not permitted to overtake before the bend because your overtaking distance would be too long, and the red car ahead might suddenly pull out to overtake as well. On curves, visibility is limited, making it risky to judge safe overtaking distances and oncoming traffic. Furthermore, you must always consider the actions of other drivers—like the red car possibly starting to overtake—since this could create a dangerous situation. That’s why overtaking before bends is generally forbidden unless you have a completely clear view and it’s safe. This rule helps prevent accidents in situations with poor visibility and unpredictable traffic behavior.