Driving technique and handling of a lorry with trailer
What this domain tests
The examiner wants to see that you understand how a trailer changes turning, braking, reversing, and stability. A C1E combination is not a large car; the trailer follows a different path and reacts to steering and speed.
Low-speed manoeuvres
- In a turn, the trailer's wheels track inside the lorry's path. Swing wider before the corner so the trailer does not clip the kerb or a pedestrian.
- Watch the trailer's outer corner as well as the inner path; the rear overhang can sweep outward.
- When reversing, steer the lorry's rear toward the intended trailer direction, make small corrections, and use a guide if visibility is poor.
- Use the mirrors continuously; if you lose sight of the trailer, stop and realign.
On-road dynamics
- Increase following distance because the combination is heavier and needs more braking distance.
- Brake in a straight line where possible; braking hard on a bend can make the trailer push the lorry wide.
- On downhill gradients, select a lower gear before the descent and use engine braking to avoid brake fade.
- Avoid sudden steering at speed; it can start trailer sway.
- If sway begins, ease off the accelerator smoothly and avoid harsh braking or counter-steering.
Overtaking and being overtaken
Allow for the combination's length before pulling out. Do not cut back in front of a vehicle you have passed; the trailer needs space. When lorries overtake you, keep a steady line and do not accelerate.
Worked example
A driver turns left into a narrow street. The lorry's front wheels clear the kerb, but the trailer's rear wheels are still outside the turn. Reasoned answer: the driver must approach from further right, delay the steering, and swing wider so the trailer tracks inside the lorry path. Turning tightly and hoping the trailer follows is the classic error.
Traps that cost marks
- Turning as if driving a car and cutting the corner.
- Braking hard while the combination is bent in a bend.
- Selecting a high gear for a steep descent and overheating the brakes.
- Correcting trailer sway with a sharp steering input.
- Overtaking without allowing for the trailer's length.