Cameroon Heavy-Vehicle Theory common mistakes
Cameroon Heavy-Vehicle Theory · Understand the traps and how to avoid them.
Reading a road sign only by its silhouette and choosing the answer that matches the shape, without checking the symbol, supplementary plate or colour inside it.
Candidates learn sign families (triangle = danger, circle = prohibition) and then stop there, so they confuse signs that share a shape, such as a speed-limit circle versus a no-overtaking circle, or a danger sign with an added distance plate.
What to do instead
For every sign question, force yourself to state three things before answering: shape, colour and the inner pictogram or number. Practise with pairs of same-shape signs side by side and write one sentence on how they differ. Treat any supplementary plate (distance, weight, time) as part of the sign, not decoration.
Treating a broken white line and a continuous white line as interchangeable when asked whether overtaking or crossing is allowed.
In everyday driving candidates see both markings constantly and stop noticing them; exam questions test the legal meaning of the continuous line and the edge line, which candidates have never had to state in words.
What to do instead
Memorise the rule set, not the picture: continuous line means no crossing, broken line means crossing permitted when safe, and combinations mean the restriction applies to the side nearest the solid line. Redo marking questions by describing the line in words first, then answering.
Approaching an unmarked or equal-priority junction and answering with the general right-hand rule even when a sign, marking or road type changes priority.
The right-hand rule is taught first and becomes a reflex, so candidates apply it without checking whether a stop sign, give-way line, or a main-road versus side-road layout overrides it.
What to do instead
Build a fixed checklist for every right-of-way question: signs present, markings present, road type, then default rule. Answer only after running the checklist. Drill mixed scenarios where the right-hand rule is the wrong answer so the override becomes automatic.
Reciting pre-trip inspection items as a list (tyres, lights, brakes) without being able to say what a failure looks like or what to do about it.
Candidates memorise the checklist order for the practical test but never link each item to a defect symptom, so scenario questions about a soft pedal, glazed brake linings or uneven tyre wear defeat them.
What to do instead
Convert each inspection item into a defect-and-action pair: symptom, risk, action (do not depart, report, repair). Practise describing defects aloud in one sentence each, focusing on brakes, tyres, steering and load security.
Calculating permissible payload from the vehicle's own empty weight and the plate, while ignoring the gross combination mass and the axle-load limit.
Candidates fixate on one number (the payload figure in the documents) and forget that a heavy vehicle is limited by several figures at once, and that the load must also be distributed so no axle is overloaded.
What to do instead
Always answer loading questions with the binding limit named: GVW, GCM, axle limit or tyre limit, whichever is lowest. Practise problems where the payload fits the gross weight but overloads the rear axle, and state how to redistribute the load.
Judging a safe following distance by 'a couple of car lengths' instead of a time gap scaled to speed and load.
Candidates transfer car habits to heavy vehicles and underestimate the stopping distance added by mass, load and, on descents, brake fade.
What to do instead
Use the two-second rule as the baseline and add a second for rain, a second for a laden vehicle, and more on descents. In questions, convert speed to metres per second and compare with the stated gap before choosing an answer.
Answering hazard-perception questions with the first hazard seen, missing the second developing hazard such as a pedestrian behind a parked lorry or a vehicle emerging from a side road.
Candidates scan the centre of the scene and react to the obvious event, whereas hazard questions reward spotting the hidden or secondary risk and the early warning sign.
What to do instead
Scan in a fixed pattern: far ahead, near ahead, mirrors, side roads, then back. For each scenario, name at least two hazards and the earliest clue (brake lights, head turn, shadow, indicator) before selecting an answer.
At an accident scene, moving an injured casualty or removing a motorcyclist's helmet as a first reflex.
Candidates want to 'help' and do not know that suspected spinal injury makes movement dangerous, or they fear the casualty cannot breathe with the helmet on.
What to do instead
Learn the priority order: secure the scene and warn traffic, call emergency services, then treat life-threatening bleeding and airway only. Move a casualty only for immediate danger such as fire. Leave helmets to trained responders unless airway obstruction forces removal with two people supporting the head.
Assuming a licence category or document covers a vehicle it does not, for example driving a heavy goods vehicle on a light-vehicle licence or overlooking a required permit or medical certificate.
Candidates know their own licence by habit rather than by the category definitions, and they forget that heavy-vehicle categories have age, medical and training conditions attached.
What to do instead
Write out each category with its vehicle definition, minimum age and conditions, and check which categories your target job actually requires. For documentation questions, list every paper the vehicle must carry (licence, registration, insurance, roadworthiness, transport authorisation) and answer only after checking the list.
Underestimating how quickly fatigue builds on long night hauls and answering that coffee, fresh air or loud music is an adequate countermeasure.
Candidates have experienced tiredness while driving and believe stimulation works, but fatigue questions test the physiological limit: only rest and sleep restore alertness.
What to do instead
Memorise the rule that stimulants mask but do not reverse fatigue, and that the correct action is to stop in a safe place and take a break or sleep. Learn the early warning signs (heavy eyelids, drifting, missed signs, yawning) and the recommended break pattern for the driving periods in the code.