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Question

Difficulty: MediumLoading the Vehicle Safely

While driving on a dual carriageway, the loaded trailer attached to your car begins to sway rhythmically from side to side (snaking). What is the safest action to take to bring the combination back under control?

  1. A
    Accelerate firmly to pull the trailer straight and eliminate the swaying
  2. Ease off the accelerator smoothly to reduce speed gradually while keeping the steering steadyAnswer
  3. C
    Brake firmly and immediately to bring the combination to a rapid stop
  4. D
    Steer quickly from side to side to counteract each swing of the trailer

Answer

Ease off the accelerator smoothly to reduce speed gradually while keeping the steering steady
When a trailer begins to snake, easing off the accelerator smoothly allows engine braking and air resistance to reduce speed gradually. Keeping the steering wheel straight and steady gives the trailer the time and stability needed to settle back into line behind the car without overloading the towbar.

Step-by-Step Solution

1
Recognise the trailer instability condition known as snaking, often triggered by crosswinds, passing large vehicles, improper weight distribution, or excessive speed.
Identify that sudden steering or aggressive braking will amplify the lateral pendulum forces acting on the towbar.
The car and trailer combination is dynamically unstable and requires gentle inputs to regain equilibrium.
2
Release the accelerator pedal smoothly and hold the steering wheel firmly and steadily in a straight line without braking sharply.
Vehicle speed decreases steadily, reducing kinetic energy and aerodynamic disturbance until the trailer naturally realigns with the towing vehicle.
Gradual deceleration reduces forward momentum and towing forces safely without inducing a skid or jackknife.

Key Concept

Recovering from trailer snaking and maintaining towing stability
Estimated Time:1m 0s
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Topics

Loading the Vehicle Safely

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