When approaching a zebra-striped pedestrian crossing where pedestrians have stepped onto the carriageway, what is the driver's legal duty?

1. Come to a complete stop before the crossing and allow the pedestrians to cross completely
2. Sound the horn loudly to force the pedestrians back onto the sidewalk
3. Accelerate quickly to pass before the pedestrians reach your lane
4. Swerve into the opposing lane to bypass the pedestrians