Swiss Category C Theory (Truck) common mistakes
Swiss Category C Theory (Truck) · Understand the traps and how to avoid them.
Treating the truck's permitted total weight (Gesamtgewicht) and the actual weighed mass as interchangeable, and answering loading questions as if the payload were simply total weight minus empty weight, ignoring axle-load distribution and the fact that the legal limit applies per axle as well as overall.
Candidates learn one headline number for the vehicle and reuse it for every question, because payload arithmetic is easy and axle loads feel like a detail. The exam deliberately presents a loaded truck where the total is legal but one axle is over, and the candidate falls back on the total-weight habit.
What to do instead
For every loading question, write down three separate limits before choosing: permitted total weight, permitted axle load front and rear, and the tyre load index. Then check the given mass distribution against each. Practise with a simple lever calculation: distance of the load from the rear axle determines its share on each axle.
Calculating braking distance with a single formula and forgetting that it grows with the square of speed, so doubling speed is answered as doubling the distance. Also mixing up reaction distance, braking distance and total stopping distance when the question asks for one of them specifically.
Everyday driving gives a linear feel for speed and distance, and candidates memorise one formula without understanding which term it belongs to. Under time pressure they pick the answer that 'looks right' rather than separating reaction, braking and total.
What to do instead
Learn the structure, not just the number: reaction distance = speed/10 x 3 (normal) or x 2 (braking-ready), braking distance on dry asphalt roughly (speed/10)^2, and total = sum. Then test yourself with a table for 30, 50, 60, 80 and 90 km/h and check that each doubling of speed quadruples only the braking part.
Answering tachograph questions from memory of the old analogue disc rules: assuming the daily driving limit is a flat 9 hours, that a break can be taken in any number of short pieces, or that the 45-minute break may be split into three 15-minute parts.
Many candidates have driven under earlier regimes or learned from colleagues, and the current split rules (at least 15 minutes then at least 30 minutes, in that order) look arbitrary until understood. The old 'any split' habit survives.
What to do instead
Build a one-page summary of the current rules and recite it: 9 hours daily driving extendable to 10 twice per week; break after 4.5 hours of at least 45 minutes, splittable only as 15 then 30; daily rest 11 hours reducible to 9 three times between weekly rests. Then answer ten practice scenarios and mark which rule each one triggers.
Reading a traffic sign or marking in isolation instead of in its sequence: for example treating a 'no overtaking' sign as permanent when a supplementary plate limits it to a distance or a vehicle category, or missing that a speed limit ends at the next junction rather than at an 'end of limit' sign.
Signs are learned as single symbols in a list, and the candidate recognises the pictogram but not the supplementary plate, the arrow, or the local rule that terminates it. Exam questions exploit exactly that gap.
What to do instead
Study signs in families with their supplementary plates and termination rules, and for each question ask: what does this sign do, to whom, from where to where? Learn the Swiss specifics that trip people: priority-road and 'end of priority' behaviour at junctions, and the difference between a prohibition and an indication.
On aquaplaning and centrifugal-force questions, choosing the answer that matches intuition ('brake firmly', 'steer harder into the curve') instead of the physically correct action: ease off the accelerator, keep the steering steady, avoid braking, and reduce speed before the curve rather than in it.
Panic responses from car driving feel correct, and the physics of a heavy vehicle (much greater mass, higher centre of gravity, longer braking distance) is not yet internalised. Candidates answer as if driving a car.
What to do instead
Learn the two governing ideas: grip is finite and shared between braking, steering and accelerating, and centrifugal force rises with the square of speed and falls with the radius. Then rehearse the correct sequence aloud for aquaplaning, for a curve entered too fast, and for a downhill bend, so the answer is recalled as a procedure, not a guess.
Answering ADR questions by treating all dangerous goods alike: assuming any hazard label means the same segregation rules, that a tunnel category restriction applies to all loads, or that the orange plate numbers are interchangeable with the hazard labels.
ADR is a large body of rules and candidates skim it, learning the diamond shapes but not the classes, packing groups, tunnel codes or the distinction between the substance identification number and the hazard identification number on the orange plates.
What to do instead
Learn the structure: nine classes, packing groups I to III, tunnel categories A to E with the restriction increasing toward A, and the two-number orange plate with the hazard identification number on top and UN number below. Then practise reading a transport document and stating class, packing group, tunnel code and what each means for the route.
Ignoring the vehicle walk-around and load-securing check as an exam topic, answering 'check the load' generically instead of naming what is checked: lashings and their tension, load distribution, the number of securing points, whether the load can shift forward under braking, and the condition of tyres and lights.
Candidates treat the daily check as routine and unexamined, so they never learn the specific items or the reasons behind them. Questions asking 'what must be checked before departure' then get a vague answer.
What to do instead
Learn the check as a fixed list in order: documents and tachograph, tyres including pressure and tread depth and damage, lights and reflectors, brakes and air pressure, load distribution and securing, body and tarpaulin, mirrors and vision. For each item know one failure it prevents, so the answer is specific.
Mixing up licence categories and their mass limits, or the fitness and medical requirements: assuming a C licence covers trailers of any weight, confusing C1 with C, or not knowing the age, medical certificate and periodic-check intervals that apply.
The categories differ by a few tonnes and by trailer coupling, and the medical rules are administrative rather than driving-related, so candidates learn them last and superficially. Exam questions test the boundaries precisely.
What to do instead
Memorise the boundaries as a small table: C1 up to 7.5 t, C above 3.5 t with a trailer up to 750 kg, C1E and CE for heavier trailers, D for buses. Then learn the fitness rules separately: medical certificate intervals by age, the duty to report changes in health, and the consequences for the licence.
Answering eco-driving questions by praising low speed in general, rather than the specific behaviours tested: early upshifting in the economical band, using engine braking and retarder instead of service brakes on long descents, avoiding unnecessary idling, and reading the road to avoid stop-start.
Eco-driving sounds like common sense, so candidates answer with a platitude instead of the technique. They also miss the link between anticipation, fuel use and brake wear, which the exam tests together.
What to do instead
Learn eco-driving as four concrete techniques with a reason each: anticipate and coast to avoid braking, shift up early and keep revs in the economical band, use the retarder on descents to save the service brakes, and switch off the engine during longer stops. Practise naming the technique a scenario is asking for.
In accident and fire scenarios, choosing 'call for help' as the whole answer and skipping the scene-safety and first-aid sequence: securing the scene and warning traffic, the correct order of rescue, when not to move an injured person, and how to tackle a vehicle fire or when not to.
Candidates hope these questions are rare and answer with the most familiar phrase. The exam tests ordered procedures, and a single missing step (warning traffic before approaching, or not opening the bonnet fully on a fire) makes the answer wrong.
What to do instead
Learn two fixed sequences and recite them. Accident: secure and warn, call emergency services with location and casualties, then first aid according to condition, not moving a casualty with suspected spinal injury unless there is immediate danger. Fire: stop, switch off, evacuate and keep clear, call the fire service, tackle only a small fire with the correct extinguisher and never against a fuel or gas fire.