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General Knowledge · Railroad-Highway Crossings

Under federal regulation, which of these vehicles must come to a complete stop at every railroad-highway grade crossing, even one with no warning lights or gates?

1.A bus transporting passengers, or a vehicle required to be marked or placarded for hazardous materials, including a cargo tank vehicle hauling hazardous materials whether loaded or emptyCorrect answer
2.Every commercial motor vehicle, regardless of what it is carrying, how many passengers are aboard, or whether that crossing has active warning devices
3.No commercial motor vehicle is ever required to stop at a crossing; every single one of them must simply slow down enough to stop if a train is coming
4.Only vehicles with a gross vehicle weight rating above 26,001 pounds, whatever cargo or passengers they happen to be carrying at the time of the crossing

Explanation

Buses carrying passengers and vehicles marked or placarded for hazardous materials, including cargo tank vehicles hauling hazardous materials whether loaded or empty, must make a complete stop at every railroad-highway grade crossing under 49 CFR 392.10. This is a narrower, more demanding rule than the one that applies to other commercial vehicles: 49 CFR 392.11 requires every other CMV only to approach a crossing at a speed that would let it stop before the nearest rail, not to stop unconditionally. The wrong options fail for different reasons: one overstates the rule to cover every CMV, one denies that any mandatory-stop duty exists at all, and one invents a weight threshold the regulation never states, since vehicle weight plays no role in which stopping rule applies.

Source: 49 CFR 392.10

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