All DGT questions
C944 questions·6 topics
DGT exam questions, C licence, with answers
Exam-style question bank for the C licence (carnet C) with correct answer and explanation. Practice free, no signup. This page gathers all 944 C licence questions in 6 topics; each links to its own answer and explanation page.
Traffic signs
- If you are driving a van with a maximum authorised mass (MAM) of four tonnes without a load, may you enter a road that has this sign at the entrance?
- Can delineation signs also indicate obstacles on a road?
- If a traffic officer raises an arm vertically and we cannot stop our vehicle safely…
- In 2026, a lorry registered in Spain is immobilised by a breakdown on a one-way urban road. How should the danger be signalled?
- Without a supplementary panel indicating another distance, a regulatory sign’s obligations, restrictions or prohibitions begin to apply from…
- Without a supplementary panel indicating another distance, a regulatory sign’s obligations, restrictions or prohibitions begin to apply from…
- The driver of a lorry with a maximum authorised mass (MAM) exceeding 3,500 kg who is about to overtake must...
- Your lorry travels in the normal direction in a lane adjoining one opened against its usual direction. There are two lanes for your direction. Which lighting and speed rule applies?
- If the width of the lorry you are driving exceeds 2.10 metres, you must know that the width indicator lights are...
- What restriction does this R-112 sign impose on a rigid vehicle travelling without a trailer?
- If you are transporting a load on the lorry you are driving that consists of posts protruding from the front of the vehicle, when must you signal it?
- A line of cones marks an area you must not enter. No traffic officer directs otherwise. May you cross that line with your lorry to overtake?
- An ordinary rigid lorry and a two-wheeled motorcycle without a sidecar reach a level narrowing simultaneously from opposite directions. Only one vehicle can pass, neither has entered, and no officer or signs regulate passage. Which has priority?
- If you are driving a lorry with a maximum authorised mass (MAM) exceeding 3500 kg, what must you always check before starting an overtaking manoeuvre to avoid endangering other road users?
- If a lorry is driving through a tunnel with one lane in each direction, is it allowed to overtake?
- With no other prohibition or restriction, does this sign alone prevent a lorry from entering?
- Under the clearance criterion in Article 91.2.a, when is stopping or parking your lorry considered dangerous or a serious obstruction?
- According to DGT final figures for Spain in 2024, counting deaths within 30 days, where were there more road deaths: urban or interurban roads?
- At a junction inside a built-up area there are two marked lanes in the same direction. With no other prohibition, a lorry overtakes a two-wheeled motorcycle on the right after checking it can do so safely. Do these overtaking rules allow it?
- A car intends to overtake your heavy vehicle. You cannot keep fully to the right edge, but the manoeuvre can be carried out safely. How may you indicate that possibility?
- An ordinary lorry not carrying dangerous goods travels outside a built-up area on a paved conventional road with one lane in each direction and a 2-metre unpaved shoulder. With no stricter sign or other restriction, what is its general speed limit?
- You drive a 6,000 kg MAM lorry through a tunnel with one lane in each direction and do not intend to overtake. Expressed in metres, what minimum gap does the rule require from the vehicle ahead?
- Which signs may warn of fatigue while driving?
- With the engine running, the red oil-pressure warning light illuminates. What condition does it warn of?
- Must an ordinary Spanish-registered lorry, without escort-vehicle duties, carry a high-visibility reflective vest?
Safe loading
- At an unsigned narrow passage, with no steep gradient or instructions from officers or authorised personnel, two vehicles of the same type must decide which reverses. Neither has priority from entering first and both would reverse the same distance. Which dimensions or mass are considered for priority?
- Under Spain’s vehicle-use classification, a vehicle carries goods in a fully enclosed compartment, with no padding or special interior adaptation and no bulk-material tank. Which designation applies?
- A lorry used exclusively for goods transport is exactly 5 metres long. It carries indivisible-length posts with proper stowage and securing, without a special-transport authorisation. What is the maximum longitudinal overhang?
- You park a 6,000 kg MAM lorry with a manual gearbox on an 8% uphill slope and will leave the driving position. The parking brake is applied and proper wheel chocks are available, but there is no usable kerb. What else must you do?
- To drive with correct tyre inflation pressure, you must ...
- If you are driving a lorry, must you know how to position and secure the load?
- A rigid four-axle lorry with conventional diesel propulsion is not carrying roundwood or operating under a special authorisation. None of its drive axles has dual tyres. Subject to technical and axle limits, which general MAM limit in Spain’s vehicle regulation table applies?
- In order to drive, the maximum height your lorry may reach will generally be...
- What is the general definition of a closed box body in the use classification, without adding the specific features of a silo or tipper?
- What is the function of the intercooler?
- Under ROTT Article 109, which maximum authorised mass threshold applies to public goods transport subject to establishment, professional competence, good repute and financial standing requirements?
- In an engine’s liquid-cooling system, what is the radiator’s main function?
- As a general rule, what is the maximum width, including the load, permitted for lorries to be driven on the road?
- A 7-metre lorry used exclusively for goods will carry an indivisible 9-metre beam. Mass limits, other dimensions, stowage and required marking conditions are met. May it carry the beam under the general overhang rule?
- As a general rule, excluding special increases, what maximum authorised mass does the Annex IX table allow for a three-axle lorry whose driven axle has twin tyres and air suspension?
- How should the load that has to be transported be stowed?
- On which assembly does a lorry’s eddy-current electromagnetic retarder act?
- What does the laden mass of a lorry include?
- Which category do motor vehicles intended for the transport of goods with at least four wheels belong to?
- In order to unload the lorry you are driving as quickly as possible, may you place the goods on the carriageway?
- A conventional diesel lorry with two single axles carries 12 tonnes on its driven axle. Under what conditions may it be driven?
- If I am driving a lorry with an MAM of 10,000 kg, what breath alcohol rate per litre of exhaled air must I not exceed to be allowed to drive this vehicle?
- Can a young driver’s lack of experience make traffic hazards harder to detect and assess?
- You park a 6,000 kg MAM lorry with a manual gearbox on a 10% slope and will leave the driving position. You have already stopped the engine, disconnected the starting system and taken the other necessary precautions. Which additional set of immobilisation measures must you apply?
- Within category N vehicles, what maximum-mass range defines subcategory N3?
Mechanics and maintenance
- A lorry has an expansion tank marked MIN and MAX. When checking coolant with a cold engine according to the manufacturer’s instructions, must you inspect the level?
- In a combustion engine with a turbocharger and intercooler, where is the intake air filter located?
- On a road surface in good condition, the steering wheel vibrates particularly at certain speeds. Which of these mechanical causes may produce this?
- On ice, up to what multiple of the normal braking distance on a dry road may a vehicle need?
- A lorry travels at night, between sunset and sunrise, on an insufficiently lit road through a built-up area. Which lights must it use?
- What does adjusting the headlights of your lorry's lighting system involve?
- Which statement about braking distance on an icy road compared with a dry road at the same speed is correct?
- To check a lorry’s oil level with the dipstick, its manufacturer specifies checking before starting, with a cold engine and the vehicle on level ground. What should you do?
- In a flooded lead-acid battery with vented caps, what are the vent openings for?
- If you keep your vehicle's tyres at the correct pressure, you will ensure that...
- In a lorry with pneumatic brakes equipped with an air dryer, which device removes moisture from compressed air to reduce the risk of freezing?
- If you anticipate needing to slow down, which behaviour supports efficient driving without compromising safety?
- When the tyre inflation pressure of your truck is higher than recommended...
- What is the purpose of a heat exchanger mechanism or intercooler?
- If the driver of a lorry observes that a vehicle has indicated its intention to turn left, may they overtake it on the right?
- One of the factors that affects driving safety is...
- If, when operating the direction indicator, the warning lamp flashes faster than normal, this indicates that...
- If a warning appears in a C1 or C truck indicating a major fault, the correct action is to:
- A lorry will overtake a cyclist outside a built-up area on a road with one lane in each direction. What minimum lateral separation must it maintain, in addition to the other overtaking requirements?
- When overtaking a car with a lorry, what safe lateral separation must be left?
- What type of oil is a lubricant classified SAE 15W-40?
- A lorry has hydraulic power steering with a reservoir marked MIN and MAX. Should its fluid level be checked?
- In a lorry diesel engine, what may abnormal black exhaust smoke be associated with?
- A lorry has a battery master switch. If the instrument panel receives no power when the ignition is switched on, what initial check concerning that switch should be made?
- In a lorry with a synchronised manual gearbox, does unnecessary double-declutching with extra throttle blips and slower shifts support efficient driving?
Goods transport rules
- Which behaviour increases crash risk when driving a lorry, even without exceeding the permitted maximum speed?
- The truck you are driving is 2 metres wide. What lights must it carry due to its width?
- The C1 licence authorizes automobiles whose MAM:
- If you have consumed a large amount of alcohol and wish to drive, what should you do?
- A cage vehicle is one that is intended for the transport of...
- Which behaviour increases crash risk when driving a lorry, even without exceeding the permitted maximum speed?
- Is the driver's sex one of the factors that can influence blood alcohol concentration?
- The C1 licence authorizes you to drive trucks whose maximum authorized mass:
- Are lorries required to have a rear fog light fitted?
- Must a complete lorry, rather than a chassis-cab, have side marker lights?
- Without special-transport authorisation, which vehicle superstructure does the dimensions table allow to be 2.60 metres wide?
- On a motorway outside a built-up area, with no lower specific limit, what is the general maximum speed for a lorry?
- In case of suffering from an illness, must the driver of a vehicle ask the doctor about the precautions that should be taken for driving?
- An 11-metre lorry follows another vehicle without signalling an intention to overtake. In which situation must it leave at least 50 metres to help following vehicles overtake, in addition to enough distance to stop without a collision?
- An ordinary lorry not carrying dangerous goods travels on a motorway outside a built-up area. With no lower sign or other restriction, what is its general speed limit?
- Driving at high speed for a long time…
- Before a C1 or C practical test, the examiner requests the applicant’s required identification documents and the applicant does not present them. What happens under Annex VI of the General Driver Regulations?
- Must a complete lorry, rather than a chassis-cab, have side marker lights?
- An ordinary lorry, not performing special transport or carrying dangerous goods, travels on a road reserved for motor vehicles outside a built-up area. With no justified reason to travel more slowly, below what general speed does Article 49 prohibit travelling?
- Within the maximum speed limits, is it possible that we are travelling at an inappropriate speed?
- When the width of the lorry is greater than 2.10 metres, what are the lights indicating this called?
- According to DGT, approximately how long can LSD-induced impairment last?
- The chest strap of the seat belt must pass over…
- What is the general maximum width of an ordinary lorry, without a temperature-controlled-body exception or special authorisation?
- In road engineering, what is the project or design speed of a road section?
Truck driving techniques
- In a truck, why must you take extra care with nearby road users during turns and merging?
- You drive a lorry at night on main beam and realise it may dazzle pedestrians walking on the shoulder. Must you switch to dipped headlights?
- You are driving a heavy vehicle of large dimensions and the width of the carriageway does not allow you to be overtaken easily. Are you obliged to facilitate overtaking?
- What precaution should you take before and during a permitted reversing manoeuvre to avoid striking a pedestrian?
- To reduce aerodynamic drag while keeping frontal area, speed and air conditions equal, what is desirable for the drag coefficient Cx?
- Why should a high-visibility vest be stored away from prolonged sunlight, following its instructions?
- When must drivers of heavy vehicles indicate that they can be overtaken?
- A category N2 or N3 lorry uses rear-view mirrors and has no approved alternative indirect-vision system. May it drive without the mandatory left main exterior mirror, replacing it with an interior mirror?
- Which of these behaviours may increase a young driver’s crash risk when carrying passengers?
- Near pedestrians or cyclists, with a C1 or C truck, you must:
- An 11-metre lorry follows another vehicle without intending to overtake. In which of these situations is the additional minimum 50-metre gap required?
- On a long downhill section in a truck, it is advisable to:
- Inside a tunnel, a lorry exceeding 3,500 kg MAM travels without intending to overtake. What minimum separation from the vehicle ahead does the regulation specify?
- To obtain the C1 licence, the DGT requires:
- Inside a tunnel, what minimum safety interval must you maintain from the vehicle travelling ahead of your lorry, which has a maximum authorised mass of more than 3,500 kg and which you do not intend to overtake?
- When driving in fog that reduces visibility, what measure should you take regarding the vehicle ahead?
- Before reversing a C1 or C truck, you must:
- A lorry not carrying dangerous goods travels on a dual carriageway outside a built-up area with no lower specific limit. What maximum speed must it not exceed when overtaking?
- If you drive your lorry having drunk alcohol, but without exceeding the maximum permitted blood alcohol level, does this pose any danger to driving?
- Before a trip with a C1 or C truck, planning it while taking its characteristics into account:
- You drive your lorry behind another vehicle and have lawfully signalled your intention to overtake it. What following gap must you still keep?
- If we are driving our lorry in a built-up area, what distance must we keep from the vehicle in front?
- In the ordinary process of obtaining a C licence by examination, besides theory and the open-road test, which other skills and behaviour test is taken?
- What is the general speed limit for a lorry on a paved conventional road outside a built-up area, with no dangerous-goods transport or other lower restrictions?
- What should you do when you see another driver intending to join the traffic flow?
Driving and rest times
- In a lorry, where is the electric retarder fitted?
- If you are not in a suitable condition to drive a C1 or C truck, you must:
- In vehicles where it is required, the tachograph mainly records:
- If you feel fatigued while driving a truck, the correct action is to:
- Aggressive driving with a C1 or C truck:
- Under Regulation (EC) 561/2006, what is the minimum duration of a regular weekly rest period?
- According to Regulation (EC) 561/2006, after 4.5 hours of uninterrupted driving, the driver must generally take:
- A driver subject to the ordinary rule of Regulation 561/2006, without the special provisions for occasional passenger transport, reaches 4.5 hours of driving and does not begin a rest period. How long is the minimum break if taken without splitting it?
- What can the driver of a vehicle do to avoid having an accident due to fatigue or sleepiness?
- For the professional driving of vehicles authorized by C1, C1+E, C, or C+E, in addition to the corresponding licence:
- According to Regulation (EC) 561/2006, daily driving time may be extended to 10 hours:
How to pass the C licence questions
This bank holds 944 exam-style DGT questions updated for 2026 for the C licence, organised in 6 topics. Each question includes the options, the correct answer and an explanation so you understand why and don't repeat the mistake.
The most effective strategy is to alternate three study modes: reading the syllabus, taking simulations under real conditions (20 questions, 20 minutes, max 2 errors) and reviewing the questions you got wrong. Failed questions enter the smart-review queue until you master them.
The questions update whenever the DGT changes the syllabus. The main 2026 updates concern new rules on personal mobility vehicles (VMPs), urban speed limits and the mandatory V-16 emergency light replacing warning triangles.
Frequently asked questions about the C licence
- How many questions does the C licence theory exam have?
- The C licence theory exam has 20 multiple-choice questions, lasts 20 minutes and allows a maximum of 2 wrong answers to pass. The questions in this bank follow that format, but it is not the official DGT bank.
- What is the minimum age for the C licence in Spain?
- The minimum age for the Spanish C licence is 21. You can start studying and enrol at a driving school earlier, but the official exam only takes place once you reach this age.
- What vehicles can I drive with the C licence?
- With the C licence you can drive: Goods vehicles over 3,500 kg.
- How many practice simulations should I do before the C exam?
- A rough benchmark is at least 15 full simulations in real format (20 questions, 20 minutes, max 2 wrong). In your last 5 consecutive simulations you should miss 1–2 questions at most before booking the official sitting.