What must you anticipate on the other side of this crest in the road?

Your answer is fully correct because all three possibilities must be considered when approaching the crest of a hill:

1. A vehicle may be stationary there: Because you cannot see past the crest, a vehicle might be stopped right behind it, for example, waiting to turn or experiencing a breakdown. You need to be prepared to brake.

2. There may be an oncoming vehicle on your side of the road: Since your view is blocked, oncoming traffic might be partially or fully across the center line. This is especially important on narrow roads where vehicles might need to pass carefully.

3. There may be a slow-moving vehicle on your side of the road: A slower vehicle could be just over the crest, making it necessary to adjust your speed or prepare to overtake safely.

In summary, when visibility is limited by a hill crest, always anticipate unexpected or hazardous situations on your side of the road and be ready to react appropriately to ensure safety.