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Bulgaria Theory Test A study materials
Bulgaria Theory Test A study resources

Bulgaria Theory Test A practice questions

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Question 1Road traffic law and regulations

What is the general maximum permitted blood alcohol concentration for a driver in Bulgaria who is not a novice or professional driver?

  1. 0.02 percent
  2. 0.05 percent Correct answer.
  3. 0.08 percent
  4. 0.00 percent

Explanation

Bulgarian road traffic law sets the general limit for blood alcohol concentration at 0.05 percent for ordinary drivers. Novice drivers and professional drivers are held to a stricter standard. Exceeding the applicable threshold is an administrative offence with serious consequences.

Question 2Road traffic law and regulations

A driver approaches a pedestrian crossing where a pedestrian is waiting to cross. What must the driver do?

  1. Continue at the same speed if no traffic is behind
  2. Change lanes and pass behind the pedestrian
  3. Sound the horn to warn the pedestrian and continue
  4. Slow down and give way so the pedestrian can cross safely Correct answer.

Explanation

Drivers must give way to pedestrians who are on a crossing or clearly waiting to use one. Approaching such a crossing requires reducing speed and being ready to stop. Failing to yield to a pedestrian at a marked crossing is a serious violation.

Question 3Road traffic law and regulations

In built-up areas in Bulgaria, what is the standard maximum speed limit unless signs indicate otherwise?

  1. 50 km/h Correct answer.
  2. 40 km/h
  3. 60 km/h
  4. 70 km/h

Explanation

The default maximum speed in built-up areas is 50 km/h unless road signs specify a different limit. Drivers must also adapt speed to traffic, visibility and road conditions. A lower limit may apply near schools or hazardous locations.

Question 4Road traffic law and regulations

When are seat belts required to be worn in a moving car?

  1. Only on roads outside built-up areas
  2. Only by the driver and front passenger
  3. By all occupants for whom a belt is provided Correct answer.
  4. Only by passengers over 18 years old

Explanation

Every occupant must use the seat belt fitted to their seat whenever the vehicle is moving. This applies in both front and rear seats and in urban and extra-urban traffic. The driver is also responsible for ensuring that minors are properly restrained.

Question 5Road traffic law and regulations

What does a continuous solid white line along the centre of the road generally mean?

  1. It must not be crossed or straddled Correct answer.
  2. It marks a parking zone
  3. It may be crossed to enter a property
  4. Overtaking is permitted if the road is clear

Explanation

A continuous centre line prohibits crossing or straddling it, which means overtaking manoeuvres that require entering the opposite lane are not allowed. The restriction protects against head-on collisions where visibility is limited. Drivers must remain in their lane until the line becomes broken.

Question 6Road traffic law and regulations

What is the meaning of a triangular warning sign with a red border?

  1. It marks a parking area
  2. It warns of a hazard ahead Correct answer.
  3. It indicates a prohibition
  4. It gives a mandatory instruction

Explanation

Triangular signs with a red border are warning signs that alert drivers to a hazard ahead, such as a bend, junction or pedestrian crossing. Drivers should reduce speed and be prepared to react. Prohibitions and mandatory instructions use circular signs instead.

Question 7Road traffic law and regulations

What must a driver do before changing lanes on a multi-lane road?

  1. Signal, check mirrors and blind spot, then move when safe Correct answer.
  2. Accelerate sharply to secure the gap
  3. Rely on the vehicle behind to slow down
  4. Signal only after starting the manoeuvre

Explanation

A lane change requires signalling in good time, checking mirrors and the blind spot, and ensuring the new lane is clear. The manoeuvre must not force other road users to brake or swerve. Only after these checks should the driver move across.

Question 8Road traffic law and regulations

Which document must a driver normally carry while driving in Bulgaria?

  1. A medical certificate only
  2. A vehicle insurance policy certificate only
  3. A roadworthiness certificate only
  4. A valid driving licence and the vehicle registration document Correct answer.

Explanation

Drivers must be able to present a valid driving licence and the vehicle's registration document when requested by the police. Proof of compulsory insurance may also be required. Carrying the correct documents is a legal obligation.

Question 9Road traffic law and regulations

A driver is involved in a collision in which a person is injured. What is the driver's primary obligation?

  1. Leave the scene to report to the nearest police station
  2. Move the injured person immediately in every case
  3. Continue driving if the injury appears minor
  4. Stop, provide assistance and call emergency services Correct answer.

Explanation

After a collision causing injury, the driver must stop, render first aid where possible and alert the emergency services and police. Leaving the scene without providing assistance is a serious offence. Moving an injured person is only appropriate when there is immediate danger such as fire.

Question 10Road traffic law and regulations

At an unmarked intersection of equal-priority roads, which vehicle has the right of way?

  1. The larger vehicle
  2. The faster vehicle
  3. The vehicle approaching from the left
  4. The vehicle approaching from the right Correct answer.

Explanation

Where no sign or marking establishes priority, the general rule gives right of way to the vehicle approaching from the right. Drivers must approach such intersections at a speed that allows them to stop if necessary. This rule prevents collisions where priority is otherwise unclear.

Question 11Road traffic law and regulations

A traffic light shows a flashing amber signal at an intersection. How should a driver proceed?

  1. Stop and wait for a green light
  2. Proceed at speed to clear the junction
  3. Proceed with caution, observing the general priority rules Correct answer.
  4. Treat it as a red light and stop

Explanation

A flashing amber light means the signal is not controlling priority, so drivers must proceed cautiously and apply the normal right-of-way rules or follow police directions. It does not require a stop if the way is clear. Speed should be reduced to allow observation.

Question 12Road traffic law and regulations

How far in advance must a driver signal before turning in normal traffic conditions?

  1. Only at the moment of turning
  2. Only if another vehicle is visible
  3. At least 50 metres before the turn
  4. Early enough to warn other road users without confusing them Correct answer.

Explanation

Drivers must signal their intention early enough to inform other road users, but not so early that the signal becomes misleading. The signal should continue during the manoeuvre and be cancelled afterwards. Timing depends on speed and traffic density.

Question 13Road traffic law and regulations

Where is parking prohibited?

  1. On a pedestrian crossing or within 5 metres of it Correct answer.
  2. In a car park outside working hours
  3. On a quiet residential street
  4. On a marked parking bay

Explanation

Parking on or close to a pedestrian crossing obstructs visibility and endangers pedestrians, so it is prohibited. The same principle applies to bus stops, junctions and other places where visibility or access is restricted. Drivers should check markings and signs before parking.

Question 14Road traffic law and regulations

What does a circular blue sign with a white bicycle symbol require?

  1. A compulsory route for cyclists Correct answer.
  2. Cyclists are prohibited
  3. Cyclists must give way
  4. Cyclists must dismount

Explanation

Circular blue signs give mandatory instructions, so a blue sign with a bicycle marks a route that cyclists must use. It is not a prohibition sign. Prohibitions use circular signs with a red border.

Question 15Road traffic law and regulations

How should a driver use fog lights in dense fog?

  1. Use rear fog lights whenever it rains lightly
  2. Keep fog lights on at all times for safety
  3. Use front fog lights only at night
  4. Use fog lights while visibility is seriously reduced and switch them off when it improves Correct answer.

Explanation

Fog lights are intended for conditions of seriously reduced visibility such as dense fog. They should be switched off once visibility improves because they can dazzle other drivers. Misuse of fog lights is an offence.

Question 16Road traffic law and regulations

A driver wishes to overtake a slow-moving vehicle on a two-way road. Which condition must be satisfied?

  1. The vehicle ahead must signal to the left
  2. The road must have at least three lanes
  3. The driver must exceed the speed limit briefly
  4. The road ahead must be clear and overtaking must be permitted Correct answer.

Explanation

Overtaking is only allowed when there is sufficient clear road ahead, no prohibition such as a solid line or sign, and the manoeuvre can be completed safely. The overtaking driver must not endanger or obstruct others. Speed limits always apply, including during overtaking.

Question 17Road traffic law and regulations

What is the purpose of the compulsory third-party liability insurance for motor vehicles?

  1. To compensate third parties for damage caused by the vehicle Correct answer.
  2. To cover the driver's medical costs only
  3. To cover damage to the insured vehicle only
  4. To replace the roadworthiness inspection

Explanation

Compulsory third-party liability insurance covers damage and injury caused to other persons by the insured vehicle. It does not cover the insured driver's own vehicle or injuries. Driving without valid insurance is prohibited and carries penalties.

Question 18Road traffic law and regulations

When may a driver use a mobile phone while driving?

  1. When stopped at a red light
  2. When the call is shorter than one minute
  3. When driving slowly in traffic
  4. When using a hands-free system that does not require holding the device Correct answer.

Explanation

Holding and using a mobile phone while driving is prohibited because it distracts the driver. Hands-free systems that allow the driver to keep both hands on the wheel are permitted. Even brief calls can impair attention.

Question 19Road traffic law and regulations

A driver approaches a railway level crossing with a lowered barrier and red flashing lights. What must the driver do?

  1. Stop before the barrier and wait Correct answer.
  2. Pass around the barrier if no train is visible
  3. Proceed slowly under the barrier
  4. Sound the horn and continue

Explanation

A lowered barrier with red flashing lights means a train is approaching, so the driver must stop before the crossing and wait. Circumventing a closed barrier is extremely dangerous and unlawful. The crossing may only be used once the barriers are fully raised and the signals stop.

Question 20Road traffic law and regulations

Under what circumstances may a driver use the horn in a built-up area at night?

  1. To signal arrival at a destination
  2. To warn of immediate danger Correct answer.
  3. To urge slower traffic to move faster
  4. To greet an acquaintance

Explanation

Horn use is restricted, especially in built-up areas at night, and is permitted essentially to warn of imminent danger. Using it for greetings or to hurry other drivers is not allowed. Unnecessary noise disturbs residents and may be penalised.

Question 21Road traffic law and regulations

What is the minimum safe following distance recommended in dry conditions at a speed of 90 km/h?

  1. About half a second behind the vehicle ahead
  2. Exactly one car length behind the vehicle ahead
  3. At least three seconds behind the vehicle ahead Correct answer.
  4. About one second behind the vehicle ahead

Explanation

The recommended following gap in dry conditions is at least three seconds, which corresponds to the distance travelled during the driver's reaction and braking time. The gap should be increased in rain, at night or when following large vehicles. A fixed car-length rule does not account for speed.

Question 22Road traffic law and regulations

A driver's vehicle begins to skid on a wet road. What is the correct response?

  1. Ease off the accelerator and steer smoothly in the intended direction Correct answer.
  2. Brake hard and turn the wheel sharply
  3. Accelerate to regain grip
  4. Pull the handbrake to stop the vehicle

Explanation

In a skid, the driver should ease off the accelerator, avoid harsh braking and steer smoothly in the direction they want the front of the vehicle to go. Abrupt inputs can worsen the loss of grip. Regaining control requires gentle, progressive corrections.

Question 23Road traffic law and regulations

A driver with a blood alcohol concentration of 0.05 percent is stopped by police. Which statement is correct?

  1. The limit only applies outside built-up areas
  2. The driver exceeds the limit and faces administrative and criminal consequences Correct answer.
  3. The limit only applies to drivers under 25
  4. The driver is within the general limit and cannot be penalised

Explanation

The general limit is 0.05 percent, and reaching that level is already an offence because the limit is a maximum, not a target. Penalties can include fines, licence suspension and criminal liability in serious cases. Novice and professional drivers face an even stricter standard.

Question 24Road traffic law and regulations

A driver intends to turn left at a junction while an oncoming vehicle is going straight ahead. Who has priority?

  1. The vehicle travelling faster
  2. The oncoming vehicle going straight Correct answer.
  3. The driver turning left
  4. Whichever vehicle enters the junction first

Explanation

A driver turning across oncoming traffic must yield to vehicles going straight ahead. The turning driver must wait until the path is clear before completing the turn. This rule prevents collisions caused by cutting across the opposite lane.

Question 25Road traffic law and regulations

How should a driver adjust speed when approaching a sharp bend on a wet road?

  1. Reduce speed before the bend and avoid braking while turning Correct answer.
  2. Keep speed constant and rely on the anti-lock braking system
  3. Maintain the posted limit and brake in the bend
  4. Accelerate through the bend to stabilise the vehicle

Explanation

Speed should be reduced before entering a bend so the vehicle is stable and grip is preserved. Braking while turning on a wet road reduces available grip and can cause a skid. Smooth steering and gentle acceleration on exit are safer.

Question 26Road traffic law and regulations

What does a solid white line along the right edge of the carriageway generally indicate to a driver?

  1. A lane reserved exclusively for overtaking
  2. A place where parking is always allowed
  3. The edge of the roadway, beyond which driving is normally not permitted Correct answer.
  4. A recommended line for cyclists only

Explanation

A continuous white edge line marks the outer limit of the carriageway, separating the driving surface from the shoulder or verge. Drivers should keep within it except in an emergency or when a specific sign or marking permits otherwise. It is not a parking or overtaking facility.

Question 27Road traffic law and regulations

A driver sees a circular sign with a red border containing the number 50 on a rural road. What does this sign mean?

  1. The maximum permitted speed is 50 km/h Correct answer.
  2. The road is 50 metres ahead
  3. The minimum permitted speed is 50 km/h
  4. A speed of 50 km/h is recommended

Explanation

A red-bordered circle is a prohibitory sign, and a number inside it sets the maximum speed allowed from that point. The limit applies until it is cancelled by another sign or by the end of the restriction. Blue circular signs, by contrast, impose minimum speeds or mandatory instructions.

Question 28Road traffic law and regulations

What is the general rule for using seat belts in a car fitted with them?

  1. Only occupants on motorways must wear them
  2. All occupants must wear them where belts are fitted Correct answer.
  3. Only the driver and front passenger must wear them
  4. Passengers in the rear are exempt in all cases

Explanation

Where seat belts are fitted, every occupant of the vehicle is required to use them while the vehicle is moving. The driver is also responsible for ensuring that children are restrained in an approved system appropriate to their size. Exemptions are narrow and based on documented medical grounds.

Question 29Road traffic law and regulations

What does a yellow diamond-shaped sign with a white border indicate?

  1. A parking area for permit holders
  2. A priority road on which the driver has the right of way at junctions Correct answer.
  3. A pedestrian zone begins
  4. A compulsory stop ahead

Explanation

The yellow diamond marks a priority road, telling the driver that side roads must give way at the junctions ahead. It is cancelled by a similar sign with a black diagonal bar. It does not remove the duty to drive with care at each junction.

Question 30Road traffic law and regulations

How should a driver signal an intention to leave a roundabout?

  1. By using the left indicator throughout the roundabout
  2. By flashing the headlights
  3. By using the right indicator before the exit being taken Correct answer.
  4. By sounding the horn on approach to the exit

Explanation

A driver leaving a roundabout must signal right in good time before the chosen exit so that following and waiting traffic can anticipate the manoeuvre. The signal should be given after passing the exit before the one intended. Headlight flashing and the horn are warning devices, not direction indicators.

Question 31Road traffic law and regulations

What is the meaning of a broken white line separating two lanes travelling in the same direction?

  1. Lane changes are prohibited at all times
  2. Lane changes are permitted when it is safe to do so Correct answer.
  3. The line marks the edge of the carriageway
  4. The left lane is reserved for buses

Explanation

A broken line between lanes in the same direction may be crossed when the driver has checked mirrors and blind spots and it is safe. The driver must still signal and must not obstruct traffic already in the other lane. Solid lines, by contrast, should not be crossed.

Question 32Road traffic law and regulations

When must a driver use dipped headlights during the day?

  1. Only when driving on motorways
  2. Only when carrying passengers
  3. When visibility is seriously reduced, such as in heavy rain or fog Correct answer.
  4. Never, because daytime running lights are always sufficient

Explanation

Dipped headlights must be used whenever visibility is significantly reduced by weather or other conditions, so that the vehicle can be seen and the driver can see. Daytime running lights alone are not adequate in poor visibility because they often do not illuminate the rear of the vehicle. Using dipped beams is also required at night and in tunnels.

Question 33Road traffic law and regulations

What does a sign showing a red circle with a white horizontal bar mean?

  1. End of all restrictions
  2. No parking at any time
  3. No entry for vehicular traffic Correct answer.
  4. Give way to oncoming traffic

Explanation

The red circle with a white bar is the no-entry sign, prohibiting vehicles from entering that road from the direction faced. It is often placed at the exit of one-way streets. Drivers must find another route rather than proceed.

Question 34Road traffic law and regulations

A driver is travelling behind a tram that has stopped at a stop without a safety island. What is the correct action?

  1. Sound the horn and drive past slowly
  2. Pass on the right between the tram and the pavement
  3. Overtake the tram on the left immediately
  4. Stop and wait until passengers have cleared the road Correct answer.

Explanation

Where passengers must cross the carriageway to reach a stopped tram, drivers must stop to let them board and alight safely. Passing on either side while people are crossing is dangerous and prohibited. The driver may proceed only once the way is clear.

Question 35Road traffic law and regulations

On a road with three lanes in the same direction outside a built-up area, which lane should a driver normally use?

  1. The leftmost lane at all times
  2. The rightmost lane unless overtaking Correct answer.
  3. Any lane, chosen freely for comfort
  4. The middle lane at all times

Explanation

Drivers should keep to the rightmost lane that is available for their direction of travel and use the other lanes only for overtaking or when traffic conditions require it. Remaining in a left or middle lane without reason obstructs faster traffic. After overtaking, the driver should return to the right.

Question 36Road traffic law and regulations

A driver wants to make a U-turn on a road with a continuous centre line and good visibility. What is the correct assessment?

  1. The U-turn is allowed if no other vehicle is visible
  2. The U-turn is prohibited because the continuous line may not be crossed Correct answer.
  3. The U-turn is allowed only at night
  4. The U-turn is allowed if the indicator is used

Explanation

A continuous centre line may not be crossed, so a U-turn that requires crossing it is not permitted regardless of visibility. The driver must find a place where the markings and signs allow the manoeuvre. Good visibility alone does not override the marking.

Question 37Road traffic law and regulations

What is the maximum permitted blood alcohol concentration for a novice driver in Bulgaria?

  1. 0.02 percent
  2. 0.08 percent
  3. 0.05 percent, the same as experienced drivers
  4. Zero, because novice drivers must not drive with any alcohol in the blood Correct answer.

Explanation

Novice drivers are subject to a zero-tolerance rule and must not have any alcohol in their blood while driving. Experienced drivers face a lower general limit but the safest and legally safest course is not to drink at all before driving. Any positive result carries serious consequences for a novice.

Question 38Road traffic law and regulations

A driver is directed by a police officer to stop at a place where stopping is otherwise prohibited. What should the driver do?

  1. Obey the officer's signal and stop as directed Correct answer.
  2. Stop only after passing the officer
  3. Ignore the signal if no sign authorises the stop
  4. Continue to a place where stopping is permitted

Explanation

Directions given by police officers controlling traffic take precedence over signs, signals and markings. The driver must stop where and when instructed and should then follow further directions. Sign-based prohibitions do not override a lawful police instruction.

Question 39Road traffic law and regulations

How should a driver respond to a vehicle displaying flashing blue lights and a siren approaching from behind?

  1. Pull over or clear a path as soon as it is safe and let it pass Correct answer.
  2. Continue normally because priority vehicles must wait
  3. Speed up to stay ahead of it
  4. Brake sharply in the same lane

Explanation

Emergency vehicles on an urgent call have priority, and other drivers must make way without endangering anyone. The correct response is to indicate, slow down and move aside when it is safe. Sudden braking in the lane can cause a collision.

Question 40Road traffic law and regulations

A driver's vehicle has a trailer whose coupling was not properly secured. What is the driver's responsibility before setting off?

  1. To rely on the workshop that last serviced the trailer
  2. To check that the coupling and safety connection are correctly secured Correct answer.
  3. To drive slowly and check the coupling after a few kilometres
  4. To ask a passenger to watch the trailer through the rear window

Explanation

The driver is responsible for the roadworthiness of the vehicle and any trailer before and during the journey. The coupling, breakaway cable and lights must be checked before moving off. Relying on others or on later checks does not discharge this duty.

Question 41Road traffic law and regulations

What does a white rectangular sign with a black diagonal stripe across a town name indicate?

  1. A parking zone for residents
  2. The start of a built-up area
  3. A diversion route through the town
  4. The end of the built-up area and its associated rules Correct answer.

Explanation

A town-name sign with a diagonal bar marks the end of the built-up area, so the general built-up speed limit and related rules cease to apply. The start of a built-up area is shown by the same sign without the bar. Drivers must adjust to the new limit beyond the sign.

Question 42Road traffic law and regulations

A driver is following a cyclist on a narrow road with a continuous centre line. How should the driver proceed?

  1. Overtake closely while staying within the lane
  2. Sound the horn repeatedly until the cyclist moves aside
  3. Cross the continuous line to pass immediately
  4. Wait behind at a safe distance until a safe overtaking opportunity arises Correct answer.

Explanation

A cyclist must be given adequate clearance when overtaken, and a continuous line may not be crossed. If there is not enough room to pass safely within the rules, the driver must be patient and wait. Pressure through horn use or close passing endangers the cyclist.

Question 43Road traffic law and regulations

Which vehicles are generally permitted to use a lane marked with the word BUS?

  1. Buses and other vehicles expressly allowed by the accompanying sign Correct answer.
  2. All cars during off-peak hours
  3. Taxi drivers at any time without restriction
  4. Motorcycles only

Explanation

A bus lane may be used only by buses and by any other category of vehicle that the accompanying sign expressly permits, such as taxis or bicycles where indicated. Other drivers must stay out of the lane during its hours of operation. The sign, not assumption, determines who may enter.

Question 44Road traffic law and regulations

A driver is involved in a minor collision with no injuries and the vehicles obstruct traffic. What should the driver do?

  1. Drive away without stopping
  2. Leave the vehicles where they are until the police arrive in every case
  3. Wait in the vehicle in the traffic lane
  4. Move the vehicles to a safe place if possible and exchange details Correct answer.

Explanation

When there are no injuries and the vehicles can be moved, they should be relocated to a safe spot so as not to obstruct traffic, and the drivers should exchange the required details. Remaining in a live lane creates a serious secondary-collision risk. Police attendance is required only in the cases defined by law.

Question 45Road traffic law and regulations

What is the general speed limit in a built-up area in Bulgaria unless signs indicate otherwise?

  1. 60 km/h
  2. 80 km/h
  3. 50 km/h Correct answer.
  4. 30 km/h

Explanation

The default maximum speed in a built-up area is 50 km/h, and lower limits may be set by signs where conditions require. Drivers must always reduce speed further when visibility or traffic demands it. Higher default limits apply outside built-up areas.

Question 46Road traffic law and regulations

A driver's load extends beyond the rear of the vehicle. What requirement applies?

  1. Marking is required only at night
  2. The load must be marked so that it is visible to other road users Correct answer.
  3. Marking is required only on motorways
  4. No marking is needed if the load is below the roof line

Explanation

A load projecting beyond the vehicle must be marked so that other road users can see its extent and avoid it. The marking requirement applies regardless of the time of day or type of road. An unmarked projection is a hazard, especially for following traffic.

Question 47Road traffic law and regulations

Two vehicles reach a narrowing of the road marked by a sign giving priority to oncoming traffic. Which driver must wait?

  1. The driver whose vehicle is larger
  2. The driver who arrived first
  3. The driver travelling downhill in every case
  4. The driver facing the sign indicating that oncoming traffic has priority Correct answer.

Explanation

Where a sign gives priority to oncoming traffic, the driver facing that sign must yield and wait at the narrow section. The rule is determined by the sign, not by vehicle size, gradient or arrival order. The priority sign for the driver's own direction reverses the position.

Question 48Road traffic law and regulations

A driver wishes to enter a road from a private driveway. What is the correct priority assessment?

  1. The driver has priority if the indicator is on
  2. Priority depends on which vehicle is larger
  3. The driver must give way to all traffic on the road being entered Correct answer.
  4. The driver has priority because the vehicle is already moving

Explanation

A driver emerging from a private driveway, garage or similar off-road area must give way to vehicles and pedestrians on the road being entered. The manoeuvre crosses a pavement and joins a public road, so caution and yielding are required. Signalling does not create priority.

Question 49Road traffic law and regulations

A driver parks on a road at night outside a built-up area. Which lighting requirement applies to the parked vehicle?

  1. The vehicle must be left with parking lights on so that it is visible Correct answer.
  2. Headlights must be left on full beam
  3. No lights are needed if the vehicle is off the carriageway
  4. Hazard lights must be used for the whole night

Explanation

A vehicle parked on the carriageway or shoulder at night outside a built-up area must display parking lights so that other drivers can see it in time. Where the vehicle can be parked fully off the road, the requirement may differ, but visibility remains the guiding principle. Full beam would dazzle and is inappropriate.

Question 50Road traffic law and regulations

A driver with a category B licence wishes to tow a trailer. Which statement reflects the general rule?

  1. A trailer may be towed only on motorways
  2. Any trailer may be towed regardless of mass
  3. The combined mass and trailer mass must fall within the limits permitted for the licence held Correct answer.
  4. A separate licence is always required for any trailer

Explanation

Towing with a category B licence is permitted only where the combined mass of the vehicle and trailer and the trailer's own mass stay within the limits set for that licence. Exceeding those limits requires the appropriate higher category. The rule is about masses, not about the type of road.