What is the primary purpose of the CTIS system on an apparatus?

The primary purpose of the CTIS system, or Central Tire Inflation System, is to adjust the tire pressure of an apparatus. This system is particularly beneficial in varying terrain and conditions that emergency vehicles may encounter. By allowing the operator to change the tire pressure while in motion, the CTIS can optimize traction, improve vehicle stability, enhance ride comfort, and reduce the risk of tire damage.

When tire pressure is adjusted, it can be lowered for off-road conditions to increase the surface area of the tire in contact with the ground, improving grip and control. Conversely, tire pressure can be increased for on-road driving to enhance fuel efficiency and handling. This flexibility is crucial for fire and rescue operations, where conditions can rapidly change, and the performance of the vehicle is critical for ensuring efficient responses to emergencies.

In contrast, other options such as enhancing braking, controlling engine temperature, or managing fuel efficiency are not the primary functions of the CTIS. Each of those functions is handled by different systems within the vehicle, which specialize in their respective areas for optimal performance and safety.