When is it permissible for a driver to change gears while approaching a railroad crossing?

Changing gears while approaching a railroad crossing is not permissible under any circumstances, making the first option the correct choice. This rule is in place for safety reasons. Changing gears can cause unexpected surges in engine power, which may interfere with a driver’s control of the vehicle at a critical moment. When a driver is focused on the potential approach of a train, it is crucial to maintain full control and attention on the crossing, as trains can come at high speeds and may not have the ability to stop in time if approached too closely.

Maintaining a steady speed and focus while approaching a crossing is essential for safe navigation. This is especially important because the driver needs to be alert to the warning signs of an approaching train. At crossings, the presence of changing gears can be a distraction, increasing the risk of an accident if a train is indeed approaching. Safe operational practices dictate that drivers are well-advised not to engage in gear changes or any other maneuver that could divert their attention from the crossing.

In contrast, the other options suggest conditions under which shifting gears might be permissible, which does not align with safe practices at railroad crossings.