What must a driver do when approaching an uncontrolled pedestrian crossing where a pedestrian has stepped onto the carriageway?

1. Sound the horn to warn the pedestrian to hurry across.
2. Reduce speed or stop to yield right-of-way to pedestrians crossing or who have stepped onto the carriageway.
3. Accelerate to pass before the pedestrian reaches the vehicle's lane.
4. Flash high beams and maintain speed.