Fuel supply cylinders on school buses and public transport vehicles must have what specific requirement?

Fuel supply cylinders on school buses and public transport vehicles are required to be positioned in a way that prioritizes safety for both the passengers and the driver. The requirement that cylinders must not be located above or within the driver or passenger compartment is crucial because it minimizes the risk of exposure to combustible fuels in areas where individuals are seated or operating the vehicle. Keeping the fuel supply cylinders outside these compartments protects occupants in the event of a leak or rupture, thereby reducing the likelihood of fire hazards and enhancing overall safety during operation.

In regards to the other options, while there may be considerations for the placement concerning visibility or other guidelines, they do not address the critical safety aspect that arises from having fuel supply cylinders too close to passengers or the driver. The focus on compartment safety is paramount in the regulations guiding the design and operation of vehicles powered by compressed natural gas, especially in environments where the safety of children and the public is a priority.