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Denmark Category D bus theory foundations study materials
Denmark Category D bus theory foundations study resources

Denmark Category D bus theory foundations practice questions

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Question 1Danish Framework

What is the primary vehicle entitlement granted by a Danish Category D driving licence?

  1. A goods vehicle over 3,500 kg carrying commercial cargo
  2. A passenger bus designed and approved to carry more than eight passengers besides the driver Correct answer.
  3. A passenger car carrying up to eight passengers and towing a heavy horse trailer
  4. A tractor unit with a semi-trailer designed for articulated freight transport

Explanation

In Denmark, Category D covers large passenger buses designed and approved to transport more than eight passengers in addition to the driver. It permits towing a trailer with a maximum authorised mass of up to 750 kg. Goods vehicles belong to Category C, ordinary cars to Category B, and combinations with heavy trailers require an E endorsement.

Question 2Danish Framework

Which driving licence category must an applicant already hold before they can obtain a Danish Category D bus licence?

  1. Category A (motorcycle)
  2. Category B (passenger car) Correct answer.
  3. Category C (large truck)
  4. Category D1 (minibus)

Explanation

Under Danish driver licensing regulations set by Færdselsstyrelsen, an applicant for Category D (large bus) must already hold a valid Category B licence for ordinary passenger cars. Category C or D1 is not a mandatory prerequisite.

Question 3Danish Framework

What is the maximum permitted total weight of a trailer that may be coupled to a large bus under a standard Category D licence alone?

  1. 750 kg Correct answer.
  2. 1,000 kg
  3. 1,500 kg
  4. 3,500 kg

Explanation

A Category D licence alone allows driving a large bus coupled with a light trailer whose maximum authorised total weight does not exceed 750 kg. If the trailer exceeds 750 kg, the driver must hold a Category D/E licence.

Question 4Danish Framework

Which licence category is legally required to operate a large bus coupled with a trailer whose permitted total weight exceeds 750 kg?

  1. Category D/E Correct answer.
  2. Category D1
  3. Category C/E
  4. Category B/E

Explanation

Whenever a large passenger bus (Category D) is operated with a trailer exceeding 750 kg maximum permitted total weight, the combination falls under Category D/E (bus with large trailer).

Question 5Danish Framework

What privilege does a Tempo 100 approval grant to a qualified Danish passenger bus?

  1. It allows the bus to drive 100 km/h on all rural non-motorway roads
  2. It permits standing passengers to travel at speeds up to 100 km/h
  3. It permits the bus to travel up to 100 km/h on motorways, provided technical safety conditions are met Correct answer.
  4. It exempts the bus driver from tachograph driving and rest time rules

Explanation

Tempo 100 certification allows an approved bus to travel at up to 100 km/h on motorways (motorveje). To qualify, the bus must meet stringent technical criteria: ABS brakes, functioning seat belts on all passenger seats, no standing passengers permitted, approved tyres, and an integrated speed limiter calibrated to 100 km/h.

Question 6Bus Passengers

Before moving away from a stop with standing passengers on board, what should the bus driver ensure?

  1. That the bus is already rolling before the doors close
  2. That doors are closed and passengers have had a reasonable opportunity to sit or obtain a secure handhold Correct answer.
  3. That every passenger is standing beside an exit
  4. That acceleration is as rapid as the engine permits

Explanation

A smooth departure starts only after doors are secured and passengers are stable. The driver must account for elderly passengers, children, wheelchair users, and anyone still moving through the saloon.

Question 7Bus Passengers

What is the safest observation sequence before closing bus doors and leaving a stop?

  1. Watch only the timetable display
  2. Close the doors first and inspect the doorway afterwards
  3. Check the interior and doorway monitors, close only when clear, confirm the doors are secured, then check exterior traffic Correct answer.
  4. Rely on passengers to shout if a doorway is obstructed

Explanation

The driver must first ensure nobody is boarding, alighting, or trapped in the door area. After closure is confirmed, exterior mirrors and traffic conditions must be checked before the bus moves away.

Question 8Bus Passengers

What does a low air-pressure warning require a bus driver to do while driving?

  1. Continue normally because a second brake circuit always guarantees full braking
  2. Apply the brake pedal repeatedly to rebuild air pressure
  3. Stop the bus safely as soon as possible and do not continue until the fault is resolved Correct answer.
  4. Switch off the dashboard warning and complete the route

Explanation

The warning means the compressed-air reserve may be insufficient for reliable repeated braking. The driver should stop safely, secure and protect passengers, and have the braking fault corrected before continuing.

Question 9Bus Passengers

What should a bus driver consider when steering away from a kerb beside waiting passengers?

  1. Only the path of the front wheels
  2. That the rear overhang always moves toward the centre of the turn
  3. That the rear overhang can swing toward the kerb and strike people or street furniture Correct answer.
  4. That passengers on the footway must move before the bus signals

Explanation

When the front of a long bus turns away from the kerb, its rear overhang sweeps in the opposite direction. The driver must check the relevant mirror and leave clearance from passengers, shelters, signs, and other roadside objects.

Question 10Bus Passengers

Who is responsible for checking that a bus is roadworthy before it enters service?

  1. Only the passenger who sits nearest the driver
  2. Only the last workshop that serviced the bus
  3. Nobody if the periodic inspection certificate is still valid
  4. The driver must perform the required checks and must not drive with a safety-critical defect Correct answer.

Explanation

A periodic inspection does not replace the driver's current roadworthiness check. Before and during service, the driver must respond to defects in brakes, steering, tyres, lights, doors, visibility, and required safety equipment.

Question 11Bus Passengers

Unless a lower local limit is posted, what is the general maximum speed limit for a standard Category D bus outside built-up areas on rural roads and expressway routes (motortrafikvej)?

  1. 70 km/h
  2. 80 km/h Correct answer.
  3. 90 km/h
  4. 100 km/h

Explanation

Under the Danish Road Traffic Act (Færdselsloven § 43), the general maximum speed limit outside built-up areas for buses with a permitted total weight exceeding 3,500 kg is 80 km/h, including on motortrafikveje, unless a lower limit is signed.

Question 12Bus Passengers

What is the general statutory speed limit for a large bus inside a Danish built-up area (tættere bebygget område)?

  1. 50 km/h Correct answer.
  2. 60 km/h
  3. 70 km/h
  4. 80 km/h

Explanation

The general speed limit in Danish built-up areas (marked by the town silhouette sign E 55) is 50 km/h for all motor vehicles, including large buses, unless local signposting specifies otherwise.

Question 13Bus Passengers

Who is legally entitled to drive in a standard designated bus lane (busbane) marked with sign E 17, unless an auxiliary plate indicates otherwise?

  1. Any vehicle carrying four or more occupants
  2. Buses in regular scheduled route service (rutekørsel) Correct answer.
  3. All privately registered buses and commercial vans
  4. Any heavy commercial vehicle over 3,500 kg

Explanation

Under Danish road traffic regulations, a designated bus lane marked with sign E 17 is reserved exclusively for buses operated in regular scheduled public service (rutekørsel). Other vehicles, including tourist coaches, taxis, or private buses, may not use the lane unless a specific supplementary plate (undertavle) explicitly permits them.

Question 14Bus Passengers

On a Danish motorway with three or more lanes traveling in the same direction, which lanes may a large bus (> 3,500 kg) normally use?

  1. Only the furthest left lane for rapid transit
  2. Only the two lanes located farthest to the right Correct answer.
  3. Any of the three lanes at the driver's discretion
  4. Only the hard shoulder (nødspor) during peak traffic hours

Explanation

Under Danish road traffic rules (Færdselsloven § 40 and the heavy vehicle curriculum), buses and goods vehicles with a permitted total weight exceeding 3,500 kg are restricted to using only the two lanes farthest to the right on motorways with three or more lanes in the same direction, except when branching off or preparing for a designated left turn.

Question 15Bus Passengers

Under normal driving conditions, what is the recommended minimum following distance for heavy vehicles like buses according to the teaching curriculum?

  1. At least 2 to 3 seconds Correct answer.
  2. At least 0.5 seconds
  3. Exactly one bus length regardless of speed
  4. At least 10 seconds in city traffic

Explanation

The official heavy vehicle curriculum specifies that a safe following distance under normal dry conditions corresponds to a time gap of at least 2 to 3 seconds behind the preceding vehicle. This time cushion allows for the driver's reaction time and the pneumatic brake buildup time of a heavy bus.

Question 16Bus Passengers

What is the bus driver's statutory duty regarding passenger seat belt use on buses equipped with seat belts?

  1. The driver must personally buckle each adult passenger before departure
  2. The driver has no responsibility because seat belt use is purely voluntary in buses
  3. The driver is only required to check that their own seat belt is fastened
  4. The driver must inform passengers that seat belt use is mandatory, via verbal announcement, signage, or audio-visual media Correct answer.

Explanation

Under Danish and European legislation, in buses equipped with seat belts, the driver (or transport operator) is legally obligated to inform passengers of the requirement to wear seat belts. This information must be provided by the driver verbally, by an automatic audio announcement, by visible pictograms at each seat, or by an informational video prior to departure.

Question 17Bus Passengers

From what age are bus passengers legally required to use fitted seat belts when traveling in Denmark?

  1. From birth, requiring rear-facing baby capsules
  2. From 3 years of age and older Correct answer.
  3. Only from 18 years of age and older
  4. Only passengers seated in the very front row

Explanation

In Denmark, all passengers aged 3 years and older are legally required to use seat belts when occupying seats where belts are fitted. Children under 3 years must use approved child restraint systems where available, or travel in accordance with specific passenger transport provisions.

Question 18Bus Passengers

What is the primary purpose of the emergency hammers (nødhamre) installed beside bus passenger windows?

  1. To shatter designated tempered-glass emergency exit windows in an evacuation Correct answer.
  2. To break open jammed automatic passenger entrance doors
  3. To release frozen pneumatic air brake lines during winter operations
  4. To adjust passenger seat backrest mechanisms

Explanation

Emergency hammers are legally required safety tools mounted beside designated emergency exit windows. Their hardened pointed tips are specifically designed to shatter the tempered safety glass of the window, creating a safe escape aperture during an evacuation when doors are inaccessible.

Question 19Bus Passengers

What is the primary emergency function of roof hatches (tagluger) on a passenger bus?

  1. To provide secondary natural ventilation during mild weather
  2. To allow maintenance personnel to inspect rooftop air conditioning units
  3. To serve as escape exits if the bus rolls onto its side or doors are blocked Correct answer.
  4. To allow luggage to be hoisted onto the roof rack

Explanation

In addition to routine cabin ventilation, bus roof hatches are certified as statutory emergency exits. In the event of a rollover crash where the bus rests on its side, the standard passenger entrance doors and side windows may be blocked or unusable, making roof hatches the primary escape route for occupants.

Question 20Bus Passengers

Which mandatory emergency safety items must be present and fully operational on a Danish commercial bus?

  1. A tow rope and two replacement headlights
  2. A spare wheel and tire changing ramp
  3. A mechanical jack and snow chains
  4. An approved fire extinguisher and a complete first-aid kit Correct answer.

Explanation

Under Danish vehicle equipment regulations (Detailforskrifter for Køretøjer) and passenger transport rules, a bus must be equipped with at least one approved, inspected fire extinguisher (ildslukker) and an accessible first-aid kit (forbindskasse / førstehjælpssæt) in good condition.

Question 21Bus Passengers

What critical physical phenomenon occurs at the rear of a long bus when the driver turns the steering wheel sharply away from a bus stop kerb?

  1. The rear tyres lift off the tarmac due to suspension rebound
  2. The rear overhang swings outward in the direction of the turn
  3. The front wheels lose pneumatic traction immediately
  4. The rear overhang swings outward in the direction opposite to the turn (bagudhængsudsvingsfare) Correct answer.

Explanation

Because of the extensive body overhang extending behind the rear axle, steering sharply to the left causes the rear right corner of the bus to swing outwards to the right over the kerb or sidewalk. This 'bagudhængsudsvingsfare' poses an acute collision hazard to pedestrians, waiting passengers, bus shelters, and light poles.

Question 22Bus Passengers

In a heavy bus equipped with dual-circuit pneumatic brakes (tokreds trykluftbremser), what occurs if one pneumatic circuit loses pressure due to a rupture?

  1. The intact secondary circuit continues to provide emergency braking capability to certain wheels Correct answer.
  2. All brakes lock up instantly at full pressure, causing an uncontrollable skid
  3. The brake pedal drops to the floor with zero remaining braking resistance
  4. The engine automatically stalls and the steering wheel locks in place

Explanation

Modern commercial buses are equipped with a dual-circuit service brake system divided into two independent pneumatic circuits (typically front axle and rear axle). If one circuit suffers a pressure drop or pipe rupture, the four-circuit protection valve isolates the leak, allowing the remaining intact circuit to provide emergency service braking.

Question 23Bus Passengers

What is the vital role of the air dryer (lufttørrer) cartridge in a bus pneumatic brake system?

  1. It heats compressed air to increase engine turbocharger boost
  2. It adds lubrication oil to the brake discs during heavy braking
  3. It filters exhaust fumes before they enter the passenger ventilation system
  4. It removes humidity and water vapor from compressed air to prevent valve freezing and pneumatic corrosion Correct answer.

Explanation

The compressor draws in atmospheric air containing moisture. The air dryer, containing a desiccant cartridge, strips water vapor from the air before it enters the storage reservoirs. Without effective air drying, condensed moisture collects in air tanks, causing internal valve corrosion and freezing solid in winter, leading to catastrophic brake failure.

Question 24Bus Passengers

How do spring brake cylinders (fjederbremser) function in the parking brake system of a heavy bus?

  1. Air pressure forces the brake shoes against the drum to park the vehicle
  2. Mechanical coil springs apply the brakes, and compressed air pressure is required to compress the springs and release the brakes Correct answer.
  3. Electric servo motors wind a steel cable around the drive shaft
  4. A mechanical ratchet locks the transmission output gear directly

Explanation

Spring brake actuators contain powerful mechanical coil springs. When parking or upon total air pressure depletion, the air chamber is exhausted, allowing the heavy springs to mechanically clamp the wheel brakes. Air pressure is required to counteract the spring force and release the parking brake before driving away.

Question 25Bus Passengers

If the low air pressure warning buzzer sounds and the red dashboard warning lamp illuminates while driving a bus, what must the driver do?

  1. Bring the bus to a safe stop immediately, as safe braking ability is critically compromised Correct answer.
  2. Accelerate to 80 km/h so the engine compressor charges the reservoirs faster
  3. Continue to the final destination as long as the brake pedal still feels firm
  4. Switch off the master electrical switch to reset the dashboard computer

Explanation

The low-pressure warning activates when system pressure falls below the safe threshold (typically around 5.5 to 6.0 bar). At this pressure, the reserve for repeated service brake applications is exhausted, and spring brakes may begin to drag or lock up unexpectedly. The driver must stop safely and immediately, evacuate passengers if in a hazardous spot, and never continue driving.

Question 26Bus Passengers

Why is the retarder (hydrodynamic or electromagnetic auxiliary brake) essential when descending long steep gradients in a bus?

  1. It increases fuel injection to keep the engine warm during downhill coasting
  2. It recharges the high-voltage starter battery while braking
  3. It provides continuous wear-free braking, protecting the foundation friction brakes from overheating and dangerous brake fade Correct answer.
  4. It prevents the bus tires from wearing on the outer shoulder

Explanation

Repeated or sustained use of friction wheel brakes on long descents generates intense heat, leading to brake fade (bremsefading), where friction material boils or glazes and braking force drops drastically. The retarder provides continuous non-friction deceleration, leaving the service foundation brakes cool and fully capable for emergency stops.

Question 27Bus Passengers

What hazard must a bus driver be particularly vigilant of when operating a retarder on wet, snowy, or icy roads?

  1. The retarder can overheat the passenger cabin heating system
  2. The retarder will instantly drain the bus electrical battery system
  3. The retarder can cause the steering wheel to vibrate vigorously
  4. The retarder acts only on the drive axle and can break tyre adhesion, inducing an immediate rear-wheel skid or jackknife on articulated buses Correct answer.

Explanation

Because the retarder applies braking torque exclusively through the vehicle's drive axle, engaging high retarder stages on slippery, snowy, or icy roads can exceed tyre-road friction on that single axle. This can instantly break lateral grip, causing the rear of the bus to skid sideways or an articulated bus to jackknife (saksning). Drivers must reduce or deactivate manual retarder stages on slick surfaces.

Question 28Bus Passengers

Under what operational conditions may a bus driver activate the pneumatic kneeling system (knælefunktion)?

  1. Only when the bus is completely stationary at a bus stop with the doors unlocked or opening Correct answer.
  2. While cruising through slow traffic to lower the vehicle aerodynamic drag
  3. While reversing into a tight parking bay to enhance rear visibility
  4. Whenever driving on rough rural cobblestone roads to soften suspension rebound

Explanation

The kneeling mechanism vents pneumatic suspension bellows on the right-hand side to lower the entrance doorway height for boarding and alighting passengers (especially elderly, disabled, or parents with strollers). It must only be operated when the bus is completely stationary at a kerb or stop. Modern buses have an electronic interlock preventing vehicle movement while kneeled.

Question 29Bus Passengers

What is the correct and safe procedure for deploying a passenger wheelchair ramp (kørestolsrampe) from a bus?

  1. Deploy the ramp while slowly rolling into the bay to save passenger timetable time
  2. Unfold the ramp without checking pavement clearance, as pedestrians will naturally move away
  3. Bring the bus to a complete halt, apply the parking brake, verify that the deployment zone on the pavement is clear, and extend the ramp Correct answer.
  4. Kneel the bus on the left side to tilt the ramp downward toward the road

Explanation

Safety protocol requires the bus to be stopped completely parallel to the kerb with the parking brake securely applied. Before deploying manual or powered wheelchair ramps, the driver or assistant must inspect the pavement to ensure no pedestrians, cyclists, or street furniture obstruct the deployment zone or create a tipping hazard for the wheelchair user.

Question 30Bus Passengers

How do sensitive door edges (klemsikring / reverseringsfunktion) safeguard boarding passengers on transit buses?

  1. They sound an external siren while crushing any trapped obstruction until it yields
  2. They automatically stop door closure and immediately reverse to open if an obstruction or passenger limb is encountered Correct answer.
  3. They permanently weld the door shut if any object interrupts the rubber seal
  4. They trigger the vehicle fire suppression system immediately

Explanation

Modern transit buses are equipped with sensitive pneumatic or optical safety edges on passenger doors (klemsikring). If a passenger, bag, or clothing is caught in the closing doors, the resistance triggers a pressure wave switch or sensor that instantly reverses the door mechanism back to the fully open position, preventing injury or dragging.

Question 31Bus Passengers

Where are emergency door release valves (nødåbnere / nødhaner) installed on a bus, and how do they work?

  1. Only in the engine bay; they must be operated using a specialized wrench
  2. Under the driver's footrest; they unlock the front steering axle
  3. Only on the exterior roof; they allow firefighters to pump foam into the saloon
  4. Inside and outside near each passenger door; turning the valve exhausts air pressure to allow manual opening of the doors Correct answer.

Explanation

Statutory vehicle safety regulations require clearly marked emergency door releases (nødåbnere) mounted both inside the cabin and on the exterior bodywork adjacent to each passenger entrance door. Operating the valve discharges the pneumatic pressure holding the door rams, enabling occupants or rescue personnel to push the doors open manually without electrical power.

Question 32Bus Passengers

What path do the rear wheels of a long bus take relative to the front wheels when making a tight turn at a street corner (off-tracking / baghjul sporing)?

  1. The rear wheels track wider than the front wheels, moving further into the oncoming lane
  2. The rear wheels cut inside the arc of the front wheels, tracking closer to the kerb or corner Correct answer.
  3. The rear wheels follow the exact same tyre tracks as the front wheels without deviation
  4. The rear wheels remain stationary until the front of the bus has completed the turn

Explanation

Due to the substantial wheelbase of a large bus, the rear axle does not follow the identical trajectory of the steered front wheels. In every turn, the rear wheels cut inward toward the center of the turn (off-tracking / sporing), traveling in a significantly tighter radius. Drivers must steer deep into the intersection before turning to prevent the rear wheels from mounting the kerb or crushing roadside objects.

Question 33Bus Passengers

When navigating a tight right-angle turn in a bus, what hazard is created by the front overhang (forendeudsvingsfare)?

  1. The front tyres will scrape against the inner wheel arch
  2. The front bumper will ground out against the road surface
  3. The outside front corner of the bus body swings wide beyond the tyre path, potentially colliding with oncoming vehicles, signs, or pedestrians Correct answer.
  4. The windscreen wiper blades will be forced off the glass by centrifugal force

Explanation

Because the bus driver's cab and front bodywork overhang forward of the steered front axle, initiating a sharp turn causes the outer front corner of the bus body to sweep through an arc wider than the front wheel path (forendeudsving). In narrow streets, this swinging front corner can strike oncoming vehicles, pedestrians on the opposite footway, or traffic signal posts.

Question 34Bus Passengers

How should a bus driver monitor the critical blind spot located directly in front of and below the high windscreen?

  1. By checking the front cross-view mirror (cyklistspejl / frontspejl) or dedicated front camera before moving off Correct answer.
  2. By sounding the acoustic horn before pulling away from every stop
  3. By opening the driver's side window and leaning out
  4. By accelerating rapidly so that small obstacles pass under the axle unharmed

Explanation

Due to the elevated seating position in a large bus, a pedestrian, child, or cyclist standing directly in front of the front bumper is completely invisible over the dashboard. Drivers must utilize the mandatory front cross-view mirror (frontspejl / close-proximity mirror) or front camera system to verify that the immediate front perimeter is clear before pulling away.

Question 35Bus Passengers

What mirror and visual observation sequence must a bus driver execute before closing passenger doors and departing from a bus stop?

  1. Look only straight ahead at the green traffic light
  2. Check only the left exterior mirror to see if approaching cars are yielding
  3. Glance quickly at the ticket machine and floor mat
  4. Check internal passenger mirrors/monitors, check door entrance areas, verify door clear, close doors, then check left and right exterior mirrors Correct answer.

Explanation

The professional safety routine requires the driver to thoroughly observe the passenger interior mirror and door video monitors to ensure no passengers are midway through boarding, alighting, or caught in the door aperture. After securely closing doors, the driver checks exterior mirrors (particularly the right mirror for trailing pedestrians/cyclists and left mirror for departing traffic) before moving off.

Question 36Bus Passengers

From the perspective of passenger safety and ride comfort, how should a professional bus driver execute braking and acceleration?

  1. Apply sudden full-force braking to bring the bus to an abrupt stop at every bus stop
  2. Pump the brake pedal rapidly to generate maximum pneumatic pressure pulses
  3. Brake progressively with smooth initial pressure, gentle deceleration, and release pedal slightly before stopping to avoid jerking Correct answer.
  4. Accelerate in the lowest possible gear with maximum engine revs at all times

Explanation

Passenger safety relies on gentle transitions. Standing and seated passengers are highly susceptible to losing balance and falling when subject to sudden inertial jerks. Professional drivers apply progressive braking, modulate pedal force smoothly, and relax the brake pedal just as the wheels stop rolling to prevent a harsh rebound (tilbageslag), ensuring passengers remain stable.

Question 37Bus Passengers

Why must a bus driver make repeated mirror checks before and throughout a right turn across a cycle track?

  1. The mirrors show whether the timetable is current
  2. A cyclist can enter a changing blind spot while the bus turns and the rear wheels cut inward Correct answer.
  3. The bus has priority over every cyclist after indicating
  4. Mirror checks remove the need to control turning speed

Explanation

The cab and bus body change angle throughout the turn, so mirror coverage and blind spots change. The driver must yield to straight-ahead cyclists, turn slowly, and continue checking until the whole bus has cleared the cycle track.

Question 38Bus Passengers

Why is driving within the engine's designated 'green RPM band' (det grønne omdrejningsfelt) fundamental to eco-driving in a large bus?

  1. It keeps the exhaust tailpipe cool so it produces white vapor instead of smoke
  2. It operates the diesel engine in its peak torque and lowest specific fuel consumption zone Correct answer.
  3. It keeps the pneumatic compressor running at 100% duty cycle
  4. It allows the automatic transmission to skip all gear changes

Explanation

Modern diesel bus tachometers mark the optimal operating range with a green sector (typically 1,000 to 1,500 RPM). Driving within this band delivers maximum torque output while minimizing specific fuel consumption (g/kWh), lowering exhaust emissions and engine noise while maintaining smooth road speed.

Question 39Bus Passengers

Which approach to a planned bus stop best combines fuel efficiency with passenger comfort?

  1. Release the accelerator early, use the vehicle's available retardation smoothly, and finish with progressive service braking Correct answer.
  2. Maintain full power until the last moment and brake abruptly
  3. Coast in neutral so no control system can slow the bus
  4. Pump the brake pedal repeatedly throughout the approach

Explanation

Early anticipation avoids wasted acceleration and allows a smooth reduction in speed. Progressive braking preserves passenger stability and keeps the service brakes available without abrupt final deceleration.

Question 40Bus Passengers

During the daily pre-trip inspection of an air brake system, how is pneumatic reservoir leakage evaluated when the engine is stopped?

  1. By checking if the compressor drive belt slips on the pulley
  2. By listening for brake shoe contact at idle speed
  3. By measuring tyre sidewall deflection under full load
  4. By observing the pressure gauges during the approved test; pressure loss must remain within the vehicle manufacturer's tolerance Correct answer.

Explanation

The driver follows the vehicle's approved leakage-test procedure and observes the pressure gauges. A drop beyond the specified tolerance or a significant audible leak indicates an unsafe defect that must be repaired before service.

Question 41Bus Passengers

How should steering free play (slør i styretøjet) behave on a modern power-assisted bus during pre-trip inspection?

  1. There should be virtually no noticeable free play with the engine running; front wheels must respond immediately to slight steering rim input Correct answer.
  2. Up to 90 degrees of steering wheel rotation before front wheels begin to turn is acceptable
  3. Free play should be tested only at 80 km/h on an empty highway
  4. The steering wheel should lock rigidly and refuse to turn when the engine is running

Explanation

In modern commercial buses fitted with hydraulic or electro-hydraulic power steering, there must be virtually zero free play (slør). With the engine running, the steered road wheels must respond smoothly and instantaneously to the slightest movement of the steering wheel rim. Excessive play indicates dangerous wear in ball joints, steering box, or universal couplings.

Question 42Bus Passengers

If a fire breaks out on board a passenger bus while driving, what is the driver's immediate primary duty?

  1. Attempt to extinguish the fire while continuing to drive toward the scheduled terminal
  2. Bring the bus to an immediate safe stop off the roadway, secure the vehicle, open all doors/exits, evacuate passengers to a safe distance, and dial 112 Correct answer.
  3. Lock all passenger doors to prevent panic while assessing the fire
  4. Drive as fast as possible to create an airflow to blow the flames out

Explanation

Life safety is paramount. The driver must immediately steer the bus to a safe location (away from flammable structures, fuel stations, or tunnel portals if possible), apply the parking brake, switch on hazard warning lights, open all passenger doors and emergency exits, direct an orderly evacuation of all occupants upwind to a safe assembly zone, and call the emergency services (112).

Question 43Bus Passengers

What must a driver verify about emergency exits before a bus begins passenger service?

  1. Only that passengers know the route number
  2. That every emergency exit is covered by luggage so it cannot open
  3. That exits, emergency releases, signs, and access routes are present, unobstructed, and serviceable Correct answer.
  4. That emergency hammers have been removed to prevent theft

Explanation

Passengers must be able to identify and reach usable exits in an emergency. The pre-service check therefore includes doors, roof hatches or designated windows, emergency releases and hammers, markings, and clear access paths.

Question 44Bus Passengers

During the Category D practical test, how must the candidate demonstrate their knowledge of statutory vehicle safety equipment?

  1. By performing checks of required vehicle equipment without the use of tools, explaining how checks are conducted, and assessing compliance with safety standards Correct answer.
  2. By disassembling the pneumatic brake chamber using hand tools
  3. By writing a 500-word essay on mechanical engineering principles
  4. By replacing a dual rear tyre on the roadside within 10 minutes

Explanation

According to Færdselsstyrelsen's test assessment directives, the candidate must demonstrate practical skill in inspecting legally required equipment without tools. The candidate must visually and functionally inspect components (lights, steering, brakes, emergency equipment, tires), explain the inspection procedure clearly to the examiner, and evaluate whether the vehicle meets roadworthiness requirements.

Question 45Bus Passengers

What is the function of the electronic anti-jackknife protection system (knækvinkelsikring / knækstyring) in an articulated transit bus (ledbus)?

  1. It monitors the articulation angle; if the angle exceeds safe limits relative to speed and road grip, it dampens the turntable joint and modulates engine power to prevent the rear section from pushing the front into a jackknife Correct answer.
  2. It automatically uncouples the rear trailer section during high-speed emergency stops
  3. It steers the trailer wheels in the opposite direction at 80 km/h on motorways
  4. It tilts the rear trailer section into corners like a motorcycle

Explanation

In rear-engine articulated 'pusher' buses (where the engine and drive axle are in the rear section), there is an inherent risk of the rear trailer pushing the middle joint out of alignment on slippery surfaces, causing a catastrophic jackknife (saksning). The electronic joint control system monitors articulation angle, wheel speeds, and steering input, dynamically increasing hydraulic damping in the turntable and reducing engine torque to maintain directional stability.

Question 46Bus Passengers

What is the operational function of the dual-circuit foot brake valve (tokreds driftsbremseventil) in a bus pneumatic brake system?

  1. It drains condensation from the pneumatic reservoirs every time the driver presses the pedal
  2. It meters compressed air proportionally from separate storage reservoirs into the independent front and rear brake circuits based on foot pedal displacement Correct answer.
  3. It switches the transmission automatically into neutral when braking
  4. It regulates water temperature in the engine cooling radiator

Explanation

The foot brake valve is the primary control organ of the service brake system. Connected directly to the driver's brake pedal, it contains two tandem internal valves that simultaneously and proportionally meter compressed air from independent reservoirs into the front and rear brake circuits, translating pedal pressure into controlled pneumatic braking force at each wheel chamber.

Question 47Bus Passengers

What is the primary operational purpose of the Advanced Emergency Braking System (AEBS) mandated on modern heavy passenger buses?

  1. To allow the bus driver to sleep while cruising on motorways
  2. To automatically overtake slower vehicles without driver intervention
  3. To deploy air cushions around the exterior bodywork before impact
  4. To detect prospective frontal collisions with preceding vehicles, alert the driver, and automatically apply emergency braking if the driver fails to respond Correct answer.

Explanation

AEBS utilizes forward-looking radar sensors and optical cameras to monitor the path ahead. If a preceding vehicle decelerates abruptly or a stationary obstacle is identified, AEBS issues cascading acoustic and visual collision warnings, applies haptic brake pulses, and if the driver takes no evasive action, automatically triggers full emergency deceleration to mitigate or prevent a rear-end collision.

Question 48Bus Passengers

How does the Lane Departure Warning System (LDWS) assist a bus driver, and when is it triggered?

  1. It monitors road lane markings via a front camera and alerts the driver via acoustic tones or haptic steering/seat vibration if the bus drifts out of its lane without indicating Correct answer.
  2. It forcefully steers the bus into the opposing traffic lane if a tyre punctures
  3. It automatically changes lanes whenever the bus approaches a slower truck
  4. It sounds an alarm inside the passenger compartment when passenger doors are opened

Explanation

LDWS utilizes a front-facing camera mounted behind the windscreen to track lane delimiter lines. If the bus begins to drift across a solid or dashed lane marking without the driver activating the corresponding direction indicator (indicating inattention, distraction, or micro-sleep), LDWS alerts the driver immediately via a loud acoustic rumble sound or haptic steering/seat vibrations.

Question 49Bus Passengers

What legal significance do the passenger numbers stated on a bus's official Danish Registration Certificate (registreringsattest) hold?

  1. They are rough guidelines that can be exceeded by up to 50% during rush hours
  2. They represent the legal limits for seated passengers only; standing passengers are completely unlimited
  3. They represent suggestions that apply only to passengers aged 18 and older
  4. They define the absolute statutory maximum capacities for seated and standing passengers, which must NEVER be exceeded Correct answer.

Explanation

The vehicle registration certificate (registreringsattest) specifies the exact approved maximum passenger capacity, subdivided into seated passengers (siddepladser) and permitted standing passengers (ståpladser). Exceeding these certified figures is a serious traffic violation, risks overloading axle limits, compromises emergency evacuation capacities, and invalidates vehicle insurance.

Question 50Bus Passengers

What should the driver do if a pre-trip tyre inspection reveals exposed cords, a deep sidewall cut, or a significant bulge?

  1. Reduce tyre pressure and begin the route
  2. Move the damaged tyre to the steering axle
  3. Cover the damage with tape and inspect it after the shift
  4. Keep the bus out of service until the defective tyre is replaced or professionally cleared Correct answer.

Explanation

Exposed reinforcement, a deep cut, or a bulge can indicate structural tyre failure. A passenger bus must not enter service with that safety-critical defect; the tyre requires qualified assessment and normally replacement.