CDL General Knowledge TestDriving SafelyHard
You are driving a commercial vehicle and must make a right turn at an intersection. What is the most critical factor to consider regarding your turning approach?
- AKeeping as close to the right curb as possible to prevent other vehicles from passing.
- BStarting wide to ensure the trailer clears the curb and other obstacles.
- CSignaling only after you have begun your turn.
- DMaintaining a high speed to clear the intersection quickly.
Show answer & explanationAnswer & explanation
Correct answer: B. Starting wide to ensure the trailer clears the curb and other obstacles.
Due to the long wheelbase of commercial vehicles, making a right turn requires you to swing wide to the left before turning right. This prevents the trailer's rear wheels from hitting the curb, signs, or other objects.
Why the other options are wrong
- A. Keeping too close to the curb will cause the trailer wheels to 'cut the corner' and hit the curb or other objects.
- C. Signaling should be done well in advance (at least 100 feet) to alert other drivers of your intentions.
- D. High speed turns are dangerous and increase the risk of rollovers or loss of control.
Right Turn Approach (CMV)
Commercial vehicles must often swing wide to the left before making a right turn to ensure the trailer clears the corner without hitting obstacles.
- Prevents 'cutting the corner'.
- Accounts for off-tracking of trailer wheels.
- Requires careful observation of surroundings.
Memory trick: Right turn, swing left, then turn right to miss the mess.