Why are you not allowed to overtake here?

Your answer is correct because in this situation overtaking is not allowed mainly for two reasons:

1. You do not have an adequate view of the road ahead. The road curves and is partially obscured by trees, so you cannot see if there is oncoming traffic, which is dangerous when overtaking.

2. Because there are cyclists on the road, you need to maintain a sufficient passing distance. If there is oncoming traffic, it would be impossible to keep a safe distance from the cyclists while overtaking.

Crossing the central lane markings (answer 3) is generally prohibited but is not the main reason in this scenario since the central line is broken and passing is allowed in other conditions. The key limitations here are safety due to visibility and the presence of cyclists.

This rule helps prevent accidents by ensuring you only overtake when you have a clear view and enough space to pass safely.