Which type of motor vehicle is prohibited from changing gears while crossing railroad tracks?

The prohibition against changing gears while crossing railroad tracks applies to motor buses due to their size and the complexity involved in operating them safely. Changing gears can cause disruptions in power delivery and control, potentially leading to dangerous situations. Motor buses typically carry a significant number of passengers and have larger weight and dimensional considerations, making it especially critical to ensure that they cross tracks smoothly and without interruption.

In contrast, passenger cars, pickup trucks, and motorcycles might not face the same level of risk since they are generally lighter and may be more maneuverable. However, the regulations prioritize the safety of larger vehicles, particularly in situations where a mistake could have catastrophic consequences for many individuals. Consequently, the laws prohibiting gear changes for motor buses while crossing railroad tracks are designed to minimize the risk of accidents and ensure the safety of both passengers and the general public.