All other tires of an apparatus should have a minimum tread depth of which measurement?

• A. 3/32 of an inch
• B. 4/32 of an inch
• C. 2/32 of an inch
• D. 1/32 of an inch

Answer: (C)

Maintaining enough tread depth is essential for traction, braking, and steering, especially on wet or slick roads. For all tires other than the front tires on an emergency apparatus, the minimum allowed tread depth is two thirty-seconds of an inch. This depth provides adequate pattern to channel water and grip the road; going below it noticeably increases stopping distance and the risk of losing control. The other options represent deeper depths, which are safer but not the stated minimum, and one thirty-second is below safe limits and would require tire replacement.