If you see a pedestrian crossing the street, what should you do?

When you see a pedestrian crossing the street, prioritizing their safety is essential. Being prepared to stop is crucial because you need to be ready to yield the right of way, which is a legal requirement in many jurisdictions. This means you should reduce your speed and come to a complete stop if the pedestrian is in or approaching the crosswalk.

Slowing down is also important as it allows you to react more effectively, giving you time to assess the situation and make safe decisions while navigating around pedestrians.

Using your horn can sometimes be appropriate if you need to alert the pedestrian to your presence or warn them of an imminent hazard, although this should be done cautiously and not as a substitute for yielding.

Thus, considering all aspects of the situation, being prepared to stop, slowing down, and knowing when to use your horn are all part of ensuring the safety of pedestrians, making "all of the answers" the most comprehensive response to the question.