As a general rule, how much clear storage space should be available beyond railroad tracks before a school bus enters the crossing?
Correct answer: B – The bus length plus 15 feet
Before committing to a railroad crossing, the driver must know that the bus can completely clear every track. The CDL manual’s general rule is to add 15 feet to the bus’s length when evaluating the containment or storage area. This is especially important when a traffic signal or stop sign could require the bus to stop beyond the tracks.
Source: Michigan Commercial Driver License Manual — § 10.4.3, “Containment or Storage Areas”

