Denmark Category C1/E Light Lorry Trailer Theory Test common mistakes
Denmark Category C1/E Light Lorry Trailer Theory Test · Understand the traps and how to avoid them.
When coupling, the candidate reverses under the trailer, closes the coupling handle, and drives off without doing a physical pull test or checking that the locking pin/jaw has fully engaged, so the trailer can separate under braking.
Candidates treat the audible 'click' of the automatic coupling as proof of a secure connection and skip the visual check of the closed jaw and locking pin, and they never lower the landing legs or connect the breakaway cable in the right order, so the coupling sequence is rushed and incomplete.
What to do instead
Learn a fixed coupling checklist and rehearse it in order: align and reverse slowly, hear and see the jaw close, confirm the locking pin is through, attach the breakaway cable and plug in the electrics, wind up the landing legs, then do a low-speed pull test with the parking brake applied before moving off. Practise the sequence until it is automatic.
The candidate checks only the lorry's own gross weight and ignores the trailer's actual load, the drawbar/nose weight, and the combination's gross train weight, so the outfit is overloaded or the nose weight is wrong for stable towing.
Candidates calculate weight from the number of pallets or from the lorry's plated figure alone, and they do not know where to find the trailer's maximum permitted mass or how nose weight affects stability, so they never verify the combination against the plated limits.
What to do instead
Before loading, read the plated gross train weight, the lorry's gross vehicle weight, and the trailer's maximum permitted mass, then calculate the actual combination weight including the trailer load. Distribute the load so the nose/drawbar weight sits within the manufacturer's range, and re-check after loading rather than assuming the plan matched reality.
On bends and in lane changes the candidate cuts the corner or swings the trailer into the adjacent lane because they steer the lorry as if it had no trailer, without using the mirrors to track the trailer's path.
Candidates underestimate how far the trailer tracks inside the turn and how much the rear of the combination sweeps out, and they look only at the road ahead instead of watching the trailer wheels in the mirrors through the manoeuvre.
What to do instead
Set up wide before the bend, keep the speed low enough to correct, and watch the trailer wheels in the mirrors as you turn. Practise offset lane positioning and right/left turns in a quiet area until you can predict the trailer's path, and always check both mirrors before changing lane.
The candidate follows too closely and brakes late on the approach to junctions and roundabouts, relying on the lorry's brakes without allowing for the trailer's extra mass and the longer stopping distance of the combination.
Candidates carry over car-driving habits and judge the gap by the vehicle in front rather than by the combination's own stopping distance, and they do not adjust for the trailer's push when braking downhill or on wet roads.
What to do instead
Apply a following-distance rule sized to the combination, brake earlier and progressively, and use engine braking and a lower gear on descents so the trailer does not push the lorry. On the approach to hazards, lift off early and cover the brake rather than reacting at the last moment.
Before driving, the candidate skips the walk-round check of the trailer: no check of tyres, lights, reflectors, marker boards, coupling security, or the breakaway cable, and no brake test of the trailer.
Candidates assume the trailer was checked when it was last used or by someone else, and they treat the walk-round as a formality rather than a legal duty, so defects such as a failed brake light or a chafed breakaway cable go unnoticed.
What to do instead
Use a written pre-drive checklist covering tyres and pressures, all lights and indicators, reflectors and rear marker boards, coupling and safety cable, landing legs stowed, and a functional test of the trailer brakes. Sign or note the check so it becomes a habit, and never move off with an unresolved defect.
The candidate misjudges overtaking and lane changes with the trailer: they pull out without a long enough gap, return to the lane too early, or forget that the combination needs far more space and time to complete the manoeuvre.
Candidates estimate the gap using car-sized assumptions and do not account for the combination's length and slower acceleration, and they return to the lane as soon as the lorry's cab clears rather than waiting until the trailer has passed.
What to do instead
Before overtaking, confirm the gap is long enough for the full combination at its limited acceleration, signal early, and use the mirrors to confirm the trailer is clear before returning to the lane. If in doubt, stay behind; a missed overtake costs less than a collision.
The candidate ignores or misuses the tachograph: wrong mode selected (other work instead of driving, or break instead of availability), no manual entry for the start-of-shift walk-round, or no record of a break taken away from the vehicle.
Candidates learn the buttons but not the rules for which mode applies to which activity, and they do not realise that loading, walk-round checks, and waiting time must be recorded correctly, so the record does not match the actual working day.
What to do instead
Learn the mode definitions and record each activity as it happens: driving for moving, other work for loading and checks, availability for waiting, break for rest. Make manual entries for any gap at the start of the shift, and record breaks taken away from the vehicle on the unit so the record matches reality.
The candidate fails to secure the load or secures it only at the front, so the load can shift rearward or sideways during braking and cornering, changing the trailer's balance and stability.
Candidates rely on the load's own weight or on friction alone, do not know the required lashing angles and number of straps, and do not check the load again after the first few kilometres when it has settled.
What to do instead
Use a lashing plan matched to the load: enough straps at the correct angle, load against the headboard where possible, and a re-check after the first few kilometres. Confirm the load cannot move forward, backward, or sideways under braking and cornering before leaving the loading point.
In rain, fog, or darkness the candidate keeps car-speed and car-following habits, does not switch on the correct lights, and does not reduce speed for reduced visibility and wet grip with a trailer.
Candidates underestimate how much longer the combination takes to stop on a wet road and how spray and darkness reduce the view of the trailer's edges, and they forget to switch from daytime running lights to dipped headlights and rear fog lights when visibility drops.
What to do instead
Reduce speed in proportion to visibility and grip, increase the following gap well beyond the dry-road figure, and use dipped headlights in rain and fog and rear fog lights only when visibility is seriously reduced. Check that the trailer's lights are working before setting off in poor conditions.
At the scene of an accident the candidate does not secure the site properly: no warning triangle at the correct distance, no warning lights, and no clear prioritisation of warning other traffic before giving first aid.
Candidates panic and go straight to the casualty or the vehicles, forgetting that on a fast road the greatest immediate danger is being struck by following traffic, and they do not know where to place the triangle relative to the combination.
What to do instead
Follow a fixed order: stop safely, switch on hazard lights, put on a high-visibility vest, place the warning triangle at the correct distance behind the scene, and only then assess casualties and call the emergency services. Rehearse the order so it holds under stress.
The candidate drives the combination in a way that wastes fuel: high revs, harsh acceleration and braking, prolonged idling, and no use of the lorry's economy aids or route planning.
Candidates focus on passing the manoeuvres and treat fuel-efficient driving as a theory-only topic, so they do not connect smooth driving, correct gear selection, and tyre pressures to the fuel and emissions figures they are asked about.
What to do instead
Drive smoothly with early gear changes, keep revs in the economy band, anticipate traffic to avoid braking and re-accelerating, switch off the engine during longer stops, and check tyre pressures regularly. Plan routes to avoid unnecessary detours and congestion.