CDL General Knowledge TestDriving SafelyEasy
A commercial driver is conducting a pre-trip inspection of their vehicle. Which of the following conditions, if found on a tire, would immediately disqualify the vehicle from operation?
- AA tread separation exposing cords.
- BUneven wear across the tire surface.
- CSlightly low air pressure, but still above the minimum recommended.
- DMinor cuts in the sidewall that do not expose cords.
Show answer & explanationAnswer & explanation
Correct answer: A. A tread separation exposing cords.
A tread separation exposing cords indicates a severe structural defect in the tire, making it unsafe for operation and requiring immediate replacement. Other issues like uneven wear or slight underinflation, while needing attention, do not typically warrant immediate disqualification.
Why the other options are wrong
- B. Uneven wear indicates a potential alignment or inflation issue but not an immediate disqualification.
- C. Slightly low pressure needs correction but doesn't immediately disqualify if above the minimum.
- D. Minor cuts without cord exposure are typically monitored but not an immediate disqualification.
Tire Disqualification Criteria
Specific tire conditions that render a commercial vehicle unsafe for operation and require immediate repair or replacement.
- Exposed cords are always a disqualifying condition.
- Tread separation indicates structural failure.
- Deep cuts or bulges can also disqualify.
Memory trick: CORD-S: Cords Out, Road Danger - Stop!