Why should a school bus driver be especially cautious using warning signals when stopping on a high-speed or poorly lit road?

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1. This concern applies only to roads with a posted speed limit under 25 mph
2. Warning signals are unnecessary on high-speed roads, since traffic naturally slows down when it comes near a bus
3. Approaching traffic may need more time and clearer signals to safely recognize and respond to the stop
4. Poorly lit roads have no bearing on how effective warning signals are

Correct!

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