If a school bus driver identifies a hazard along a route or at a bus stop, what does Unit D1.11 require training on?

49 CFR Part 380, Appendix D, Unit D1.11

A hazard noticed by one driver, like a downed sign or an unsafe stop location, can affect every other bus and driver using that same route. Following a defined state or local reporting procedure ensures the hazard gets fixed or flagged for everyone, not just worked around by the one driver who happened to spot it.