Near Ootmarsum, on a provincial road, you are overtaking a tractor. Halfway through you see oncoming traffic approaching sooner than expected. What may you now use your horn or light signal for?

Also simply to announce your presence while overtaking

Only to avert the imminent danger of the situation

Also to express your annoyance that the tractor is not pulling aside

Explanation

False — Expressing annoyance is not an imminent danger; the signal is not intended for that (Book p.183).