On a divided highway (with a physical median or barrier), what is required when a school bus stops with red lights flashing in the opposite direction?

On a divided highway with a physical median or barrier, most states require only traffic in the same direction as the bus to stop. Traffic on the opposite side of the barrier is presumed to be separated from any crossing students by the physical median. State laws vary on what counts as a 'divided' highway: a painted line is not enough in most states; a physical median (curbed, grassy, or barrier-separated) is required. Always verify your specific state's rule, and when in doubt, stop — a stopped car is never worse than a hit student. Even when stopping is not required, slowing down and being alert is best practice.