Which description matches Class 4 Apparatus?

• A. Aircraft Rescue and Fire Fighting Apparatus.
• B. Tractor drawn apparatus, such as aerials.
• C. Most ambulances and smaller fire apparatus.
• D. Large Fire Apparatus and Heavy Rescue Vehicles.

Answer: (B)

Understanding how fire apparatus are configured helps you predict how they handle on the road. Class 4 refers to tractor-drawn units, where a separate tractor pulls a trailer that carries the aerial device. That setup—two-part vehicle with a tractor and a towed ladder or platform—drives distinct driving characteristics: a long overall length, potential trailer sway, and different steering and braking dynamics compared to single-chassis rigs.

The description provided matches this arrangement precisely, describing a tractor-drawn apparatus such as aerials. This is the scenario that defines Class 4, so it’s the best fit.

Other descriptions refer to different equipment with different handling: aircraft rescue and fire fighting units are specialized airport rigs; ambulances and smaller fire apparatus describe light, self-contained units; large fire apparatus and heavy rescue vehicles are typically big, single-chassis rigs with integrated equipment, not towed trailers.