Denmark Category C Truck Theory Test common mistakes
Denmark Category C Truck Theory Test · Understand the traps and how to avoid them.
On multiple-choice questions, selecting only the first correct-looking option and moving on, when the question actually asks for every applicable answer (for example all the situations in which a class C driver must use a tachograph record).
Candidates transfer the habit of single-answer school tests and skim past the wording 'hvilke' or 'alle gældende' in the Danish prompt, so they stop reading once one plausible option appears.
What to do instead
Before answering, underline the question stem words that signal quantity (en, alle, hvilke, mindst). Count how many options you have marked and re-read the stem to confirm the number matches. Practise with sets where at least a third of questions are multiple-answer so the checking habit becomes automatic.
Treating the tachograph as a device that only starts counting when the truck moves, and forgetting to record other work, availability and breaks manually.
Candidates learn the automatic driving-time recording and assume everything else is captured too; the manual-entry mode switch (other work, availability, break/rest) is a small part of the syllabus and gets skipped in revision.
What to do instead
Memorise the four mode positions and what each means, then rehearse a full fictional day: loading (other work), waiting at a dock (availability), lunch (break), driving. Be able to state that the driver must ensure the correct mode is selected at each change of activity, and that forgetting is an infringement even if driving time itself is compliant.
Applying the car speed limit on a rural road with a truck over 3.5 tonnes, or assuming the general 80 km/h limit applies on all roads outside built-up areas.
Habits from the category B test carry over, and candidates do not separate the general limits from the lower limits that apply specifically to lorries, buses and vehicles with trailers.
What to do instead
Build a one-page table of lorry-specific limits (built-up areas, rural roads, motorways, and the situations where a lower posted limit or a limit for vehicles above a certain weight overrides the general rule). Test yourself by naming the limit for a given road type and vehicle combination before checking the table.
Calculating axle load from the total weight divided by the number of axles, and assuming the result proves the vehicle is legally loaded.
The arithmetic is simple and feels authoritative, but real axle loads depend on where the mass sits relative to the axles, and the drive axle of a laden tractor unit is usually far heavier than a simple average suggests.
What to do instead
Learn to reason about the load's centre of gravity: mass placed behind the rear axle of a rigid truck unloads the front axle and overloads the rear, and on a tractor unit the fifth-wheel position matters. Always check each axle against its plated maximum and the total against the gross vehicle weight, and treat the average as meaningless.
Securing cargo with a single strap over the middle of the load and calling it done, without lashing to the correct anchor points or using the required number of lashings.
Candidates remember 'use straps' as a slogan and never learn the underlying principle that the securing force must equal a defined fraction of the load's weight, so they cannot judge when one strap is enough and when it is not.
What to do instead
Learn the two methods (top-over lashing and direct lashing) and the idea that the required securing force scales with load weight and depends on friction. Practise judging a load description: mass, friction, anchor points available, and decide the number and arrangement of lashings, then justify it in one sentence.
When a warning light for a brake or air-pressure fault appears, continuing to the next stop instead of stopping immediately and investigating.
Candidates study warning-light symbols as pictures to be recognised in a test, not as instructions for behaviour, so the symbol is learned without the action attached to it.
What to do instead
For each dashboard symbol, learn a paired response: what it means, whether to stop immediately, whether to continue to a workshop, and what to check. Focus on the red air-pressure and brake warnings, ABS/EBS, and the park brake, and be able to explain why a lorry with insufficient air pressure must not be driven.
Braking late and hard into a bend, or changing gear mid-corner, instead of slowing before the bend and holding a steady speed through it.
Candidates drive cars where these habits are survivable, and underestimate how much a laden lorry's mass and high centre of gravity change the consequences of load transfer and sudden inputs.
What to do instead
Adopt a fixed routine: assess the bend, brake in a straight line to a speed you can hold, select the correct gear before turn-in, then maintain a gentle constant throttle. Practise explaining what happens to the load and the outer wheels if you brake mid-corner, so the routine is tied to a reason rather than a rule.
Underestimating stopping distance at speed and following too closely, especially in rain or on a wet motorway, because the candidate uses the two-second car gap.
The gap rule is taught in car training and candidates do not adjust it for a much heavier vehicle, longer braking distance, and the reduced grip of a laden lorry on a wet surface.
What to do instead
Learn the lorry stopping-distance figures and the way they grow with speed and with low friction, then apply a minimum three-second gap in dry conditions and double it in rain. Be able to explain why a laden lorry needs far more distance than the car in front and why the gap must be set by your own stopping distance, not the car's.
On an alpine-style descent, relying on the footbrake continuously and only selecting a low gear after the brakes start to fade.
Candidates treat the service brake as the default way to control speed, and do not connect continuous braking to heat build-up, fade and the risk of total brake loss on a long gradient.
What to do instead
Learn the rule that the gear is chosen before the descent and the engine brake or retarder carries the braking, with the footbrake used only for short applications to keep speed in check. Be able to state why a lorry with overheated brakes may have no braking at all, and what to do if fade begins.
Answering environmentally friendly driving questions with vague statements about 'driving smoothly' rather than naming concrete techniques and their effect on fuel use.
The topic feels like common sense, so candidates do not study it as a technical subject and cannot connect specific behaviours to consumption figures or emissions.
What to do instead
Learn a small set of named techniques with a reason attached: early upshifting, keeping engine speed in the economical band, using cruise control on motorways where appropriate, anticipating traffic to avoid stopping, switching off the engine during long waits, and correct tyre pressure. For each, be able to say what it saves and why, so the answer is specific rather than a slogan.