Jordan Driving Theory Heavy common mistakes
Jordan Driving Theory Heavy · Understand the traps and how to avoid them.
Treating the air-brake low-pressure warning buzzer and the spring-brake (parking brake) pop-out as unrelated events, so the candidate answers that the truck simply 'loses power' when pressure drops.
Candidates memorise the buzzer threshold (~4.5–5 bar / 65–75 psi) and the spring-brake application threshold (~2–3 bar / 30–45 psi) as two separate numbers without understanding that both are stages of the same pressure-loss sequence, so they cannot describe what the driver actually experiences.
What to do instead
Rehearse the pressure-loss sequence as one story: compressor failure → pressure falls → low-pressure warning at the higher threshold → spring brakes apply automatically at the lower threshold → vehicle stops. Practise the daily drain-down test so the order of events becomes physical memory rather than two isolated figures.
Building the load or planning the route by total gross weight only, ignoring per-axle and per-group limits, and answering 'legal' whenever the total is under the permitted maximum.
Gross weight is the number printed largest on the registration and the one candidates hear most often; axle-group limits (steer axle, drive group, trailer group, and the kingpin-to-rear-axle spacing rule) require more steps and are easy to skip under time pressure.
What to do instead
Adopt a fixed three-check routine for every weight question: gross weight, individual axle loads, then axle-group loads with correct spacing. Practise reading a weighbridge ticket and redistributing a load by sliding it forward or back to bring each axle within limit before declaring compliance.
Answering load-securing questions by counting straps alone ('four straps is enough') rather than calculating the required lashing capacity from the cargo mass and the friction of the load bed.
Strap counting feels intuitive and is what candidates see in everyday practice, whereas the tie-down formula and friction coefficients look like exam-only theory, so candidates skip the calculation and guess from the number of straps.
What to do instead
Learn the relationship explicitly: required total lashing force = (cargo mass × acceleration coefficient) minus the friction contribution, then divide by the lashing capacity of one strap. Work through several numeric examples with different bed surfaces (steel, wood, anti-slip mat) so the friction term stops being abstract.
Describing a downhill descent by saying 'use the brakes to hold speed' instead of naming a low gear, engine braking or retarder, and a controlled service-brake application.
Candidates transfer light-vehicle habits to heavy vehicles and underestimate brake fade; continuous service braking feels safe in the cab and the consequence only appears minutes later, so the wrong answer looks plausible.
What to do instead
Memorise the descent drill: select a gear low enough that the retarder or engine brake alone holds the target speed, use the service brake only in short firm applications to shed speed, and never ride the pedal. Practise identifying the correct gear before the descent begins, not on it.
Treating daily driving time, daily rest and the weekly total as one combined limit, so the candidate answers that a driver 'has used up the day' after a break or confuses a reduced daily rest with a reduced daily driving period.
The rules have several parallel counters (daily driving, extended daily driving, weekly driving, fortnightly driving, daily rest, reduced rest, break after 4.5 hours) and candidates collapse them into a single mental budget because the numbers overlap.
What to do instead
Draw a one-page counter sheet with a separate row for each limit and its permitted extensions per week or fortnight. For every practice scenario, write each counter out before answering, and check the break rule (45 minutes, splittable into 15 + 30) separately from the rest rule.
Answering sign questions from the shape and colour alone without checking the supplementary plate, so a prohibition sign with an exemption plate or a distance plate is read as applying universally.
Candidates learn the basic shape-colour code early and then stop reading the whole sign; supplementary plates are small and are mentally treated as decoration rather than as part of the legal meaning.
What to do instead
Train on complete sign assemblies: for each practice item, state the main sign, then the supplementary plate, then the combined rule in one sentence. Build a habit of asking 'who is exempt and from where to where?' before choosing an answer.
Choosing 'sound the horn and continue' or 'maintain speed because I have right of way' in hazard-perception items involving vulnerable road users, cyclists, or a vehicle emerging from a concealed entrance.
Candidates optimise for not losing time and equate legal priority with safety; the exam rewards the defensive response, and the priority answer is deliberately attractive because it is technically correct about the law.
What to do instead
Apply a fixed priority order in every hazard item: identify the hazard, predict the worst plausible outcome, then choose the action that removes the risk even at the cost of time. Practise scanning the scenario for the phrase 'could' rather than 'is', since hazards are about what might happen.
Skipping or rushing the pre-trip walk-around, particularly the brake test, tyre condition and load security check, and answering inspection questions from general knowledge rather than a defined sequence.
The walk-around is repetitive and candidates believe a visual glance is sufficient; there is no single memorable order, so items are recalled ad hoc and the brake test in particular is reduced to 'press the pedal'.
What to do instead
Memorise a fixed clockwise route around the vehicle with a named check at each stop, and rehearse the brake test as a sequence: build pressure, engine off, listen for leaks, check the warning, then confirm the spring brakes hold. Recite the route aloud until the order is automatic.
Answering fire and incident-response items by opening the bonnet fully, using water on a fuel or electrical fire, or moving an unconscious casualty without assessing the scene first.
Candidates answer from film-level intuition rather than procedure, and the correct sequence (stop, secure the scene, warn traffic, call emergency services, then attempt limited first aid) has more steps than the instinctive single action.
What to do instead
Learn the incident sequence as a checklist: protect the scene and other traffic, call emergency services with location and cargo details, then act. For fire, know which extinguisher class applies to fuel, electrical and solid-material fires, and know that a bonnet is opened only slightly to admit an extinguisher.
Treating documentation and licensing questions as common sense, so the candidate assumes the licence category, driver card, ADR certificate or insurance cover transfers automatically to a heavier vehicle or a different operation.
These topics feel administrative rather than technical, so candidates do not build a mental model of which document proves which entitlement, and the distinctions (vehicle category, permitted trailer mass, professional competence certificate, goods versus passenger operation) blur together.
What to do instead
Build a document map: for each item (driving licence category, driver qualification card, driver card for the tachograph, transport licence, insurance certificate, ADR certificate) write what it proves, who issues it, its validity period and what happens if it is missing. Test yourself by asking which document an inspector would request in a given scenario.