Ontario MTO Truck Knowledge Practice Test

Question: 1 / 400

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

Apply both service and trailer brakes

Release all brakes

Apply service brakes only

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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