CDL Combination Vehicles TestCoupling and UncouplingHard
What is the minimum clearance required between the tractor frame and the trailer's landing gear during turns, according to safety guidelines?
- AAt least 8 inches.
- BAt least 4 inches.
- CAt least 6 inches.
- DAt least 2 inches.
Show answer & explanationAnswer & explanation
Correct answer: C. At least 6 inches.
Safety regulations and best practices recommend a minimum clearance of at least 6 inches between the tractor frame and the trailer's landing gear, especially during turns. This ensures that the landing gear does not strike the tractor frame, air tanks, or battery box, which could cause significant damage or a loss of control.
Why the other options are wrong
- A. While more clearance is always better, 8 inches is not the minimum standard and might indicate an issue with trailer height or fifth wheel placement.
- B. 4 inches might be acceptable in some static positions but is often too little for turns.
- D. 2 inches is generally considered insufficient for dynamic movement.
Landing Gear Clearance
The minimum vertical and horizontal distance maintained between the trailer's landing gear and the tractor's frame/components, particularly during turns.
- Prevents component damage.
- Ensures safe maneuvering.
- Typically 6 inches minimum clearance.
Memory trick: Six inches of space keeps parts in their place.