Traffic safetyQuestion #16170Multiple correct
To warn the driver of the vehicle you are overtaking of your intention outside a built-up area, you may:
Explanation
The rules give two ways to draw the attention of the driver of the vehicle being overtaken: flashing your headlights (allowed everywhere) or using the horn (allowed only outside built-up areas).
KET reference: KET 89: To draw the attention of the driver of the vehicle being overtaken, you may flash your lights, and outside built-up areas use the horn.