When must the driver of a bus with a manual transmission avoid changing gears?
Correct answer: C – While crossing railroad tracks
Federal rules require a passenger bus to cross railroad tracks in a gear that permits completion of the crossing without changing gears. The driver must not shift while on the tracks. Selecting the proper gear beforehand reduces the risk of stalling or losing momentum within the crossing.
Source: Texas Commercial Motor Vehicle Drivers Handbook — § 4.3.5, “Railroad-highway Crossing/Stops”, 49 CFR § 392.10(a) – Railroad grade crossings; stopping required

