When must a driver give way to an emergency vehicle with its blue and red beacons and siren on?
Explanation
An approaching emergency vehicle with its beacons and siren on has absolute priority. All road users must give way at once, pulling aside and opening up an emergency corridor for it.
KET reference: KET 12: road users must give way at once to approaching emergency vehicles with their blue and red (or blue only) beacons and special siren on.