What restriction applies to fuel trucks carrying flammable materials?

The restriction that applies to fuel trucks carrying flammable materials is that they may not go in breezeways and underpasses. This is crucial for safety reasons, as these areas may have limited ventilation, which can increase the risk of fire or explosion in the event of a fuel spill or leak. Avoiding breezeways and underpasses helps to minimize the risk to personnel and infrastructure in the airport environment.

Typically, regulations are designed to manage the inherent dangers that come with transporting flammable materials, and restricting access to these confined spaces is a preventive measure to ensure safety. While it may be commonplace for vehicles to operate within open spaces and roadways, ensuring that fuel trucks do not traverse areas that could pose additional risks is critical for maintaining safety protocols in airside operations.

The other options, such as maintaining a specific speed limit, operating only during daylight hours, or having a fire extinguisher aboard, might be considerations for best practices, but they do not carry the same level of restriction as not entering breezeways and underpasses, which directly relates to safety during the transportation of flammable materials.