Denmark Category D/E Bus Trailer Theory Test common mistakes
Denmark Category D/E Bus Trailer Theory Test · Understand the traps and how to avoid them.
On coupling questions, the candidate states that the trailer is safely connected as soon as the coupling head has clicked onto the ball, without mentioning the safety indicator, the lock check, or the secondary connection (breakaway cable or safety chain).
Car drivers rarely tow, so the coupling procedure is learned by rote from a checklist and the candidate remembers only the visible 'click' step. The examiner's wording ('when is the combination ready to drive?') invites a one-word answer, and the candidate gives the last action performed rather than the full verification sequence.
What to do instead
Learn coupling as a fixed sequence that must be completed and then checked: correct drawbar height, coupling locked with the indicator showing green/closed, safety cable or chain attached to a designated point (not looped over the ball), jockey wheel raised and secured, electrics plugged in and lights tested, then a physical pull-up test and a walk-round light check before moving off. Practise reciting the sequence aloud in the same order every time, and always end with the verification step, not the attachment step.
When asked about reversing a bus with trailer, the candidate describes steering 'away from the danger' or answers with the car-and-caravan rule without stating that the bus's rear overhang and limited rear visibility change the geometry and that a banksman is required.
The candidate has transferred a rule of thumb from B/E without thinking about the bus body: the long rear overhang means the trailer swings wide, and the bus mirrors do not show the trailer's near side. Under exam pressure the candidate answers the general principle and skips the combination-specific consequence.
What to do instead
Answer in three parts: (1) direction - steer so the trailer goes where you want it, i.e. turn the wheel towards the side you want the trailer to move when reversing in a straight line, and be ready to counter-steer immediately; (2) geometry - the bus's rear overhang amplifies trailer swing, so the swept path is wider than intuition suggests; (3) procedure - get out and look, use a banksman or guide, reverse slowly on the clutch/idle with hazard lights on, and stop if you lose sight of the guide. Practise the manoeuvre in a yard with cones until the counter-steering becomes automatic.
The candidate calculates total combination length or weight by adding the bus's permitted figures to the trailer's permitted figures, instead of using the actual laden weights and the legal maximum for the combination, and forgets that the trailer's maximum permitted weight must not exceed the bus's towing capacity.
Weight questions are usually answered from memory of the registration document rather than from first principles. Candidates confuse maximum permitted mass, actual mass and train weight, and they have often never looked up the towing capacity plate on their own vehicle.
What to do instead
Work every weight question through three columns: actual, maximum permitted, and combination limit. State the rule explicitly - the sum of the actual axle loads must not exceed the axle limits, the actual total must not exceed the maximum train weight, and the trailer's maximum permitted mass must not exceed the bus's stated towing capacity even if the trailer is empty. For length, quote the combination limit and note that the trailer counts in full. Rehearse with the plate values of a real bus so the numbers are concrete.
On driving-and-rest-time questions, the candidate applies the passenger-carrying daily driving limit of 9 hours but forgets the weekly and fortnightly totals, the 45-minute break split rule, or the requirement to be able to show records for the current day plus the previous 28 days.
Candidates memorise the single most quoted number (9 hours, extendable to 10 twice a week) and treat the rest of the regulation as detail. The rules are spread across several articles and the exam asks about the less-quoted limits precisely because they are the ones drivers get wrong in practice.
What to do instead
Build a one-page summary sheet with the figures side by side: daily driving 9 h (10 h twice per week), weekly 56 h, fortnightly 90 h, break after 4.5 h of at least 45 min (splittable into 15 + 30), daily rest 11 h reduced to 9 h no more than three times between weekly rests, and the 28-day record-retention rule. Test yourself by writing the sheet from memory weekly, and be able to state which rule a given scenario breaches, not just the number.
The candidate describes the tachograph as recording 'driving time' and omits manual entries for other work, availability and breaks, and cannot explain what to do when the card is missing, faulty or left in another vehicle.
In training the emphasis is on driving time, and the candidate has never had to make a manual entry. The distinction between the four activity modes and the legal duty to correct records is abstract until it is practised.
What to do instead
Learn the four modes with a concrete example each (driving, other work such as vehicle checks and loading, availability such as waiting at a terminal, break/rest) and the rule that the card must be in the slot whenever the driver is in the vehicle and must be withdrawn at the end of the shift. Practise a printout-and-annotate exercise: print a day's record, mark the missing periods, and write the manual entry with the reason. Know that a missing or faulty card requires a printout at the start and end of the day with name, date and signature.
In a first-aid scenario the candidate says 'call 112 and wait' without describing scene safety, the recovery position, control of severe bleeding, or what to do for a passenger who is unconscious but breathing versus not breathing.
First aid is often revised last and from a summary list, so the candidate remembers the emergency number and little else. The scenario wording ('what do you do first?') also tempts a single action when the examiner wants an ordered sequence.
What to do instead
Answer every first-aid question as a sequence: secure the scene and warn traffic, assess responsiveness and breathing, call 112 (or direct a named person to call and report back), then act - recovery position for an unconscious but breathing casualty, CPR at 30:2 for a non-breathing casualty, direct pressure and elevation for severe bleeding, and do not remove an impaled object. Learn the contents and location of the bus first-aid kit and fire extinguisher, and rehearse the sequence aloud so the order is automatic.
When asked about load securing in the trailer, the candidate says 'strap it down' without naming the lashing capacity, the number of straps, the anchor points on the trailer, or the need to check the load after the first few kilometres.
Load securing is treated as common sense rather than a technical subject, and the candidate has no mental model of the forces involved (forward force in braking, lateral force in cornering). Vague verbs feel like sufficient answers.
What to do instead
Learn the principle: the load must be secured against forward, rearward and lateral forces, using the trailer's rated lashing points and straps whose lashing capacity is stated on the label. Be able to state that the load must be checked shortly after departure and at intervals, that the trailer floor and headboard must be sound, and that a load must not protrude beyond permitted limits without marking. Practise by describing a specific load (e.g. luggage cages or pallets) and naming the anchor points and strap count you would use.
The candidate answers a braking or stability question with 'brake gently' and does not mention the trailer's overrun brake, the risk of jack-knifing or snaking, engine braking on long descents, or the increased stopping distance of the laden combination.
The candidate has driven only a solo bus and has no feel for the trailer pushing from behind. The physics of overrun braking and trailer swing is not intuitive and is rarely demonstrated in training.
What to do instead
Learn the mechanism: the overrun brake applies the trailer brakes when the bus slows, so smooth, progressive braking keeps the combination straight; sudden braking on a bend or in the wet can cause the trailer to push the bus out of line. On long descents select a low gear and use engine braking to avoid brake fade, and keep speed low enough that the trailer never begins to snake. Learn the response to snaking: ease off the accelerator, do not brake hard, and steer straight. Practise emergency stops with the trailer on a closed course in the wet.
On turning questions the candidate ignores the swept path of the trailer and the bus's tail swing, and answers only about the front of the bus clearing the corner.
The candidate drives the bus by reference to the front wheels and mirrors, and the trailer is out of sight behind. The tail swing of a long rear overhang and the cut-in of the trailer's wheels are invisible from the driving seat.
What to do instead
Learn to plan a turn in three reference points: the front of the bus clearing oncoming traffic and kerbs, the rear overhang swinging out on the inside of the turn, and the trailer wheels cutting in on the inside of the turn - the last is the one that hits kerbs, poles and pedestrians. Before turning, check both mirrors and the blind spot, take the widest safe position, keep speed low, and watch the trailer in the mirrors through the turn. Walk a real junction on foot to see the swept path, then practise the turn with an instructor.
The candidate treats the daily walk-round check as a formality and cannot name the combination-specific items: coupling security, breakaway cable, trailer lights and indicators, trailer tyre condition and pressure, and the trailer brake test.
Walk-round checks are learned as a list of bus items, and the trailer is not part of the candidate's habitual routine. The check is also often done in a hurry at a depot with the trailer already coupled.
What to do instead
Build a written checklist with two sections, bus and trailer, and perform it in the same order every day: coupling and safety cable, jockey wheel stowed, electrics and all lights including indicators and brake lights (use a helper or a reflection), tyre tread and pressure on the trailer, wheel nuts and indicators, then a brake test at low speed before entering traffic. Sign the checklist and note defects. Rehearse the checklist on a real combination until it takes under ten minutes and nothing is skipped.