Final answer:
Vehicles traveling in the opposite direction of a school bus that has stopped to load or unload children on a divided highway must come to a complete stop and wait until all children are safely across the roadway.
Step-by-step explanation:
According to traffic laws, when encountering a school bus that has stopped to load or unload children on a divided highway separated by a median or barrier, vehicles traveling in the opposite direction should come to a complete stop and wait until all children are safely across the roadway and the bus signals them to proceed. This is to ensure the safety of the children.
Passing the bus cautiously or honking the horn to alert the children and the bus driver are not correct actions in this situation, as they can jeopardize the safety of the children.
Therefore, the correct answer is option 1) Must come to a complete stop and wait until all children are safely across the roadway and the bus signals you to proceed.