The vehicle in front of you has stopped short of a pedestrian crossing. You want to overtake it. What must you do?

1. Also stop short of the crossing, and move off only once you are sure no pedestrian is using or about to use it
2. Pass immediately, because the stopped vehicle has already checked the crossing
3. Pass slowly on the left, between the stopped vehicle and the kerb
4. Sound the horn once and then pass at normal speed