When traveling on a four-lane roadway without a median, what is required of traffic?

When traveling on a four-lane roadway without a median, it is essential to understand that all traffic is required to stop when a school bus has its stop sign extended and lights flashing. This rule is in place to protect children who may be entering or exiting the bus. In the case of a four-lane roadway without a median, there is no separation between directions of traffic, which means that vehicles traveling in both directions must come to a complete stop to ensure the safety of those children. This requirement highlights the importance of being vigilant in areas where children might be present, especially around school buses where they are more vulnerable.

The implication of the other options involves different scenarios that do not accurately represent the laws surrounding school buses on this type of roadway. Only vehicles behind the bus stopping does not take into account traffic approaching from the opposite direction, which must also be controlled for safety.