Seats, Stanchions, Rails. Visors and Defroster. The sun visor shall be located in front and above the driver and passenger position. Heaters, Step or Stepwell, and Vents. Fire Extinguisher, First Aid Kit, and Tire Chains. Every school vehicle shall be equipped with a nontoxic dry chemical fire extinguisher having a rating of at least 5 lb./10 B.C. and equipped with a gauge, and first aid container mounted in plain view in the driver's compartment and, when applicable, tire chains. Warning Devices. Color, Signs, Lettering, Retro-Reflective Tape, and Identification.