Ontario MTO Truck Knowledge Practice Test

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Prepare for the Ontario MTO Truck Knowledge Test with our engaging quiz, featuring multiple choice questions, hints, and explanations for each answer. Get ready to ace your exam and ensure a successful driving career!

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If your vehicle starts jackknifing, what action should be taken?

  1. Apply both service and trailer brakes

  2. Release all brakes

  3. Apply service brakes only

  4. Apply trailer brakes only

The correct answer is: Apply trailer brakes only

In the situation where a vehicle begins to jackknife, the correct action is to apply the trailer brakes. This approach helps bring the trailer under control and can assist in straightening out the vehicle as it begins to skid. Applying the trailer brakes allows the rear of the vehicle to slow down without causing the tractor portion to continue moving forward aggressively, which can worsen the jackknife situation. When jackknifing occurs, the primary objective is to regain control of the trailer, as it is often the trailer that is causing the imbalance. By using only the trailer brakes, you can effectively manage the skid and work towards stabilizing the whole rig. Other options might involve either over-controlling the situation or not responding effectively to the imbalance. Releasing all brakes or applying only the service brakes could lead to greater instability, allowing the trailer to swing out further and possibly increasing the risk of a crash.

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