What type of vehicles must stop at all railroad crossings?

Vehicles that are carrying explosives or flammable liquids must stop at all railroad crossings due to the extreme potential hazards associated with these materials. This requirement is in place because the risk of an accident is significantly increased if these types of vehicles were to be involved in a collision with a train. Stopping at the crossing allows the driver to check for oncoming trains and reduces the likelihood of catastrophic incidents that could result not just in harm to the vehicle and its occupants but also to the community and the environment.

Other vehicle types, such as fire trucks, passenger vehicles, and all trucks, do have specific regulations regarding railroad crossings, but they do not carry the same universally mandated stop requirement as vehicles transporting hazardous materials. Fire trucks may stop under certain conditions, but not at all crossings. Passenger vehicles and trucks typically only need to yield or stop when required by signage or conditions. Therefore, the regulation is tailored specifically to the heightened risks associated with transporting dangerous goods.