Kuwait Commercial Driving Theory key terms

The total weight of a vehicle plus everything it carries at a given moment: chassis, body, fuel, driver, passengers and cargo. It must never exceed the maximum figure stated on the vehicle's registration and plate.

The weight of cargo and passengers a vehicle is allowed to carry, calculated by subtracting the empty vehicle weight from the permissible maximum weight. Overloading reduces braking performance and damages the suspension.

The weight of a vehicle when empty of cargo and passengers but with fuel, coolant, oil and standard equipment in place. It is the starting point for calculating how much load may legally be added.

The share of a vehicle's total weight carried by one axle, measured at the tyres on that axle. Exceeding the axle limit overloads tyres and brakes even when total vehicle weight is legal.

Spreading cargo so that weight is balanced across axles and kept low, with heavy items over or between axles. Poor distribution changes steering and braking behaviour and can overload one axle.

The use of straps, chains, ropes, bars or sheeting to stop cargo moving, sliding, rolling or falling during travel. Securing must suit the load's weight, shape and surface and be checked during the journey.

The point at which a vehicle's weight is effectively concentrated. A high or badly placed centre of gravity makes a vehicle more likely to tip over in turns or sudden steering.

The distance a load or vehicle body extends beyond the front or rear axle. Excessive rear overhang swings wide in turns and must be marked, and it is limited by regulation.

Warning devices required when a load extends beyond the vehicle's sides or rear, such as red flags by day and red lights or reflectors at night, so other road users can judge the vehicle's true size.

The highest total weight at which a vehicle may legally be operated on public roads, set by the manufacturer and recorded in official documents. Any higher figure is an offence.

A reinforced fitting on a vehicle's chassis or deck designed to take the force of straps or chains. Only rated points should be used, and the securing system must match the load's weight.

A systematic check of tyres, brakes, lights, fluids, mirrors, load securing and warning equipment carried out before starting a journey. Defects found must be reported and corrected before departure.

A circular visual inspection of the vehicle before each shift, covering tyres, wheels, lights, reflectors, coupling, bodywork, leaks and load. It catches problems that would be costly or dangerous later on the road.

A written record of any fault found on a vehicle, submitted to the operator so repairs can be scheduled and tracked. Driving with a known safety defect that has not been reported is an offence.

A check that the air pressure system builds and holds pressure, that warning buzzers and gauges work, and that no audible leak exists. Low pressure can cause brake failure, so the test is done before driving.

An official document confirming a vehicle has passed periodic technical inspection of brakes, steering, lights, emissions and structure. Operating without a valid certificate is illegal and usually voids insurance.

The scheduled government or authorised technical examination a commercial vehicle must pass at set intervals. It verifies safety systems, emissions and structural condition against the standards in force.

Loss of braking power caused by overheating of brake drums or discs after repeated heavy use, common on long descents. The pedal or air pressure feels normal but the vehicle slows poorly.

Using a lower gear so the engine's compression resists the vehicle's speed on a descent, reducing reliance on the footbrake. It helps prevent brake fade and loss of control on long hills.

An emergency escape lane filled with gravel or sand, built on steep descents for drivers who lose braking. Steering into it deliberately is far safer than continuing out of control.

The gap kept between your vehicle and the one ahead, lengthened for heavy vehicles, wet roads, poor visibility or a full load. A safe gap gives time to stop if traffic halts suddenly.

The total distance covered from noticing a hazard to coming to rest, made up of thinking distance plus braking distance. It rises sharply with speed, weight and slippery surfaces.

An area around a large vehicle that the driver cannot see in the mirrors, especially alongside and directly behind. Other road users lingering there are at risk during turns and lane changes.

The path a long vehicle's rear wheels take inside the front wheels' track when turning, so the tail sweeps outward. Cyclists and pedestrians in that space can be struck if the driver turns without checking.

Regular use of both side mirrors and any interior or camera view before moving off, changing lanes, turning or opening a door. Mirrors must be adjusted before the journey begins.

A style of driving that anticipates other people's mistakes and leaves room to react, rather than assuming everyone obeys the rules. It includes early hazard scanning, smooth control inputs and avoiding confrontation.

The empty road area kept around your vehicle on all sides so you have room to manoeuvre or stop if something goes wrong. It is maintained by adjusting speed and lane position early.

The skill of spotting developing risks, such as a pedestrian approaching a crossing or a car edging from a side road, early enough to act smoothly. It relies on scanning far ahead and checking mirrors often.

Applying the brakes firmly and fully in a crisis while keeping steering control, without pumping unless the vehicle lacks anti-lock brakes. The aim is to stop in the shortest safe distance.

An electronic system that rapidly releases and reapplies brake pressure to stop wheels locking, so steering remains possible during hard braking. A pulsing pedal during use is normal and expected.

Loss of tyre grip so the vehicle slides rather than follows the steering, usually from braking, accelerating or steering too harshly on a slippery surface. The correction is to ease off and steer where you want to go.

When water on the road lifts the tyres off the surface and the vehicle floats, leaving steering and braking ineffective. It is prevented by slowing down in heavy rain and keeping tyre tread deep.

A crash in which the vehicle tips onto its side or roof, most often from taking a bend too fast, steering sharply or carrying a high load. Heavy vehicles with high centres of gravity are especially vulnerable.

The legal limits on how long a commercial driver may drive and work within a day and a week, recorded in a logbook or tachograph. They exist to prevent fatigue-related crashes.

The minimum uninterrupted break a driver must take after a set amount of driving or duty time. Rest must be genuine time away from driving duties, not loading or paperwork.

The required continuous off-duty block within each 24-hour period, during which the driver is free of all work obligations. It is longer than a short break and must be taken where sleep is possible.

An instrument that automatically records driving time, speed, distance and rest periods, now usually digital. Tampering with it or failing to use it correctly is a serious offence.

The mental and physical tiredness that slows reactions and judgement, causing lapses in attention and micro-sleeps. It is managed by proper rest, planned breaks and not driving when drowsy.

The thickness of rubber remaining on a tyre's surface, measured in millimetres against the legal minimum. Worn tread lengthens stopping distance and raises aquaplaning risk in rain.

The required set of dressings, bandages, gloves and other supplies carried in a commercial vehicle for treating injuries before help arrives. It must be complete, in date and stored where it can be reached quickly.

The first actions at a crash: stopping safely, switching on hazard lights, placing warning triangles and moving people away from traffic before giving aid. Protecting the scene prevents further casualties.

Contacting police, ambulance or fire services with the location, number of casualties, hazards and your contact details. Clear, calm information speeds the response and should be given before other tasks.

The written record completed after a collision, covering time, place, parties, vehicle details, damage, injuries and witnesses. It supports insurance claims and official investigations and should be factual.

Techniques that cut fuel use and emissions: smooth acceleration, early gear changes, steady speed, correct tyre pressure, avoiding unnecessary idling and planning routes. It also reduces wear on the vehicle.

Leaving the engine running while the vehicle is stationary, which burns fuel and pollutes the air for no benefit. Switching off during long waits is both economical and often legally required.

A system holding a set speed without the driver's foot on the accelerator, useful on long, level motorway runs. It should not be used in heavy traffic, rain or on winding or slippery roads.

Choosing the journey in advance to avoid congestion, roadworks and weight-restricted roads, and combining loads where possible. Good planning saves fuel, time and stress and prevents illegal route errors.

A circular sign showing a maximum permitted vehicle weight, often with a goods-vehicle symbol. Drivers must check their gross weight against it, as the limit applies even when the vehicle is empty.

Painted lines on the road surface that separate lanes, mark edges or show where overtaking is allowed. Solid lines generally mean no crossing; broken lines permit it when safe.

The grouping of signs by shape and colour: circles for orders, triangles for warnings, rectangles for information and direction. Recognising the category helps drivers obey a sign even before reading it.

The maximum legal speed for a road or vehicle class, shown by signs or set by general rule. Limits are upper bounds, not targets; conditions may require driving well below them.

A legal rule or sign forbidding overtaking in specified places, such as near crossings, bends, hill crests or where a solid line runs. Heavy vehicles often face additional overtaking bans.

The priority a road user has at a junction, roundabout or crossing under the traffic rules. Having right of way does not remove the duty to avoid a collision if another driver fails to give it.