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Vehicles transporting certain hazardous materials are required to stop at highway rail grade crossings to ensure the safety of both the vehicle occupants and rail workers. When it comes to transportation regulations, Division 2.3 Chlorine is classified as a toxic gas, and federal regulations necessitate that any vehicle carrying such hazardous materials must stop at rail crossings. This is crucial because toxic substances pose significant risks, and stopping allows the driver to check for any approaching trains, thereby preventing potentially catastrophic incidents.

In contrast, the other vehicles listed, such as the motorcoach, box truck, and pickup truck, do not fall under the same stringent regulation regarding highway rail grade crossings. For instance, while buses may need to stop under specific conditions such as carrying certain hazardous materials, they are not mandated to stop at all rail crossings unless they are likewise transporting particular freight or hazardous materials that require such caution.