CDL Combination Vehicles TestDriving Combination Vehicles SafelyMedium
A commercial driver is operating a combination vehicle and must navigate a tight urban intersection with pedestrians and other vehicles. What is the most critical defensive driving principle to apply when turning a combination vehicle in such an environment?
- AInitiate the turn as wide as possible, using all available lanes for the swing.
- BConstantly monitor mirrors for 'off-tracking' (trailer path) and potential hazards, and signal well in advance.
- CAccelerate quickly through the turn to minimize the time spent in the intersection.
- DAssume other drivers and pedestrians will yield the right-of-way due to the size of the combination vehicle.
Show answer & explanationAnswer & explanation
Correct answer: B. Constantly monitor mirrors for 'off-tracking' (trailer path) and potential hazards, and signal well in advance.
Off-tracking is a significant concern for combination vehicles during turns. Continuous mirror checks allow the driver to monitor the trailer's path and react to any hazards or vehicles/pedestrians entering the path of the trailer.
Why the other options are wrong
- A. While a wide turn is often necessary, simply using 'all available lanes' without careful monitoring can be dangerous and illegal.
- C. Accelerating through a tight turn with a combination vehicle increases the risk of rollover or losing control, and reduces reaction time.
- D. This is a dangerous assumption. Defensive driving means anticipating others' mistakes, not expecting them to yield.
Combination Vehicle Turning
When turning a combination vehicle, always account for off-tracking by monitoring mirrors and anticipating the trailer's path. Signal early and take turns slowly.
- Off-tracking is key concern.
- Constant mirror checks.
- Signal early, turn slowly.
Memory trick: Mirrors Track, Hazards Back.