Your view of the road ahead is blocked by a dip in the road, a bend, or a large vehicle in front, so you cannot see far enough to judge an overtake safely. What is the correct action?

1. Wait until you have a clear, uninterrupted view of the road ahead before overtaking
2. Overtake anyway, since the other vehicle will move over if there is a problem
3. Sound your horn and pull out slightly to see further before deciding
4. Overtake only using the vehicle's mirrors, without checking the road directly