All DGT questions
C1832 questions·6 topics
DGT exam questions, C1 licence, with answers
Exam-style question bank for the C1 licence (carnet C1) with correct answer and explanation. Practice free, no signup. This page gathers all 832 C1 licence questions in 6 topics; each links to its own answer and explanation page.
Traffic signs
- Inside a tunnel with several lanes of traffic in your direction, you are driving your lorry behind another vehicle which you intend to overtake. What separation must you maintain between both vehicles before starting the move?
- If you are driving an unladen lorry with a maximum authorised mass of 5 tonnes, may you enter a road at whose entrance this sign is displayed?
- On a road, may a lorry reverse as a manoeuvre complementary to a U-turn?
- As a general rule, above what width must a lorry be fitted with end-outline marker lights?
- At the entrance to a carriageway, what does this sign indicate?
- On a narrow, steep section, with no signs or officer regulating priority, a truck and a car cannot pass each other. The uphill vehicle cannot reach a passing place first. Which vehicle has priority?
- 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?
- As a general rule, may a goods lorry use a VAO high-occupancy lane because it is loaded or empty, when it is not providing an emergency or road-maintenance service and has no exceptional authorisation from the traffic authority?
- Outside a built-up area, your lorry is on a carriageway with two normal lanes in its direction. The vehicle in the left lane is not signalling a left turn or a stop on the left. May you pass it on the right solely because it is travelling more slowly?
- At an unsigned narrowing, without officers, roadworks or a steep gradient, a rigid lorry and a car, both without trailers, entered together. If one must reverse, which one?
- If I am driving a two-axle truck with a maximum authorised mass (MAM) of 18 tonnes, may I enter a road if this sign is placed at its entrance?
- Entry onto the motorway must be made…
- Which belief held by a child pedestrian can increase risk when crossing the carriageway?
- Outside a built-up area, a lorry travels on a carriageway with two lanes in its direction. Traffic is not saturated, and the vehicle in the left lane is not signalling a left turn or stop. May the lorry overtake on the right merely because that vehicle is slower?
- This sign indicates:
- If you join a road with your lorry using its acceleration lane, how must you do so?
- What does the principle of anticipation in defensive driving consist of?
- If you are driving a heavily loaded truck and see this sign, in addition to indicating the gradient, it helps you decide that…
- In 2026 a Spanish-registered lorry is immobilised by a breakdown on a Spanish interurban road and cannot resume travel. How must it warn other users while the obstruction is removed?
- An ordinary 9,000 kg MAM lorry, without special transport or dangerous goods, travels on a motorway with no lower specific limit. What is its general maximum speed?
- 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?
- In 2026 a Spanish-registered lorry is immobilised by a breakdown on a Spanish interurban road and cannot resume travel. How must it warn other users while the obstruction is removed?
- A lorry carries indivisible poles projecting forward within the ordinary permitted limits. When must that forward-projecting load be marked with a white light?
- You drive a car and are temporarily stopped at a STOP sign. Under what conditions may you make a telephone call?
- A lorry with a 4,000 kg MAM travels outside a built-up area on a paved conventional road. Without dangerous goods, special transport or a lower limit, what is its general maximum speed?
Safe loading
- A lorry over 3,500 kg MAM follows another vehicle without signalling an intention to overtake. In which situation does the additional minimum 50-metre gap apply to allow a following vehicle to overtake?
- A lorry has a non-driven front steering axle and a single rear drive axle. Which axle contains the half-shafts that transmit drive from the differential to the wheels?
- 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?
- How should the load that has to be transported be stowed?
- During an ordinary loading or unloading operation, what rule applies to where you deposit the goods?
- An ordinary trailer or semi-trailer has a MAM no greater than 750 kg. Does it need its own traffic-authority registration to be used on the road?
- A lead-acid battery with accessible cell caps permits water top-ups under its manufacturer’s instructions. What maintenance should be carried out according to those instructions?
- The figure indicating the load index fitted to an industrial vehicle consists of two numbers separated by a slash, for example: 150/146. What does this indicate?
- The maximum permitted mass for a single non-driven axle is…
- By definition, an open-bodied goods vehicle is a:
- You park a 4,000 kg MAM lorry on a significant downhill slope and will leave the driving position. Other required measures are already applied, and you choose a usable kerb instead of wheel chocks. How should the steered wheels be positioned?
- What is the function of the drain valves on a pneumatic brake system’s compressed-air reservoirs?
- When replacing a blown fuse with another one, what must be considered primarily?
- 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?
- Under the general dimensions-table limit, what is the maximum length including load of an ordinary road train, excluding 45-foot intermodal operations, vehicle transporters, euro-modular combinations, approved aerodynamic extensions and special transport?
- What is the name given to the set of components fitted between the wheel axles and the bodywork or, where applicable, the chassis?
- During a manufacturer-specified check, the lorry is stationary, the engine is off and the brake is not being operated. What may indicate an air-brake circuit leak?
- After immobilising a 5,500 kg MAM lorry on a significant uphill gradient, the driver leaves the seat. In addition to the parking brake and first gear (or P), how can it be secured if no suitable chocks are available and there is a kerb?
- An adult drives a goods vehicle with a MAM exceeding 3,500 kg. Under RGC Article 20, what breath alcohol level must the driver not exceed?
- What is the purpose of the bleeder in a hydraulic braking circuit?
- For goods vehicles other than tractor units, which two thresholds does the Ministry of Transport Road Transport Observatory (2026) use to classify them as heavy?
- When loading or unloading goods on a public road is unavoidable, may the goods be deposited on the carriageway, shoulder or pedestrian areas?
- How far may the divisible load on your lorry overhang, as a general rule?
- To drive a C1 or C truck safely, it is advisable to keep especially clean:
- In ordinary driving, without special authorisation to use the shoulder or an officer’s instructions, may a lorry exceeding 3,500 kg MAM use the shoulder for travelling?
Goods transport rules
- When replacing this halogen bulb, which precaution prevents grease deposits that could damage it when heated?
- Under the wording of Annex VI.A.2 of the General Driver Regulations, after two unsuccessful attempts, what minimum interval is specified between the second and third, except for a justified exceptional reduction?
- What is blood alcohol concentration?
- May an ordinary lorry driver hold a telephone conversation while driving without using their hands, audio headsets or earphones?
- Between the two attempts of the same the C1 and C licences application there should normally be no more than:
- A lorry has aerodynamic air deflectors designed for its configuration and correctly adjusted. Can they help reduce fuel consumption?
- As the base time, without extensions for videos or duly justified special needs, how much time is allowed per question in the C1 or C specific knowledge test?
- Under the wording of Annex VI.A.2 of the General Driver Regulations, what minimum interval is specified between successive attempts after the third, except for a justified exceptional reduction?
- Someone applying for the C licence who already holds C1 is exempt from:
- Without an emergency or a traffic officer’s instruction, you wish to make a voluntary stop on a two-way interurban road. May you choose the left side to use the phone or programme the navigation system?
- Speed limits when driving a C1 or C truck:
- What driving behaviour can cocaine use promote?
- The tests for the C1 and C licences are normally taken in:
- During the practical tests for the C1 and C licences, the use of phones or other data-transmission systems:
- 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?
- In the DGT Road Safety manual’s general analysis, which factor contributes most to crashes: human, vehicle or road?
- An adult drives a goods vehicle with a MAM exceeding 3,500 kg. Under RGC Article 20, what breath alcohol level must the driver not exceed?
- With a C1 licence, the base vehicle may tow:
- Without special-transport authorisation, which vehicle superstructure does the dimensions table allow to be 2.60 metres wide?
- The general minimum age to obtain the C licence is 21, although it may be obtained at 18 if:
- With a truck, height, width, or mass limits must:
- With moisture and temperatures near or below 0°C, which areas require particular caution for possible ice?
- Classes C1 and C apply to vehicles:
- During the knowledge test for the C1 and C licences, what happens if the applicant uses a mobile phone to receive unauthorised help?
- 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?
Mechanics and maintenance
- When approaching a foreseeable stop, if conditions allow safe deceleration, what helps save fuel in a combustion-engine vehicle?
- In a lorry’s friction clutch with a manual gearbox, which component is pressed against the flywheel to transmit engine rotation to the gearbox input?
- Should you periodically check the level of the windscreen washer fluid?
- Stopping distance when braking for a hazard is the sum of...
- In a conventional four-cylinder, four-stroke engine, how far does the crankshaft rotate during one complete piston stroke from one dead centre to the other?
- If your lorry’s engine takes too long to reach normal operating temperature, which component should be checked?
- A lorry is driven at night, with good visibility and no conditions permitting fog-light use. May it travel with position lights alone?
- By definition, a heated lorry is a motor vehicle that is:
- A lorry circuit requires nominal 24 V and has two compatible 12 V batteries. Which connection adds their voltages?
- When overtaking a car with a lorry, what safe lateral separation must be left?
- Before driving a truck, which option includes checks of its safety systems rather than only fuel or cleanliness?
- In a combustion-engine vehicle with electronic injection that does not require accelerator input to start, which practice avoids unnecessary fuel use when starting the engine?
- In a lorry with a liquid-cooled combustion engine, the engine takes abnormally long to reach operating temperature. Which component regulates coolant flow to the radiator and should be checked?
- If, due to traffic conditions, a lorry with an MAM (maximum authorised mass) of more than 3,500 kg becomes stationary inside an underpass, among other obligations, the driver must...
- In a liquid-cooled engine whose coolant pump is belt-driven, which fault may reduce coolant circulation and cause overheating?
- What benefit is supported by keeping lorry tyres at the recommended cold pressure for their load?
- If, due to traffic requirements, a truck with a maximum authorised mass (MAM) of more than 3,500 kg becomes immobilised inside an underpass, among other obligations, the driver must...
- What is the “fading” effect that a vehicle's brakes can suffer from?
- If a vehicle's steering system shows unstable behaviour and pulls to one side, what should we check?
- If, when operating the direction indicator, the warning lamp flashes faster than normal, this indicates that...
- If a warm engine persistently emits bluish exhaust smoke, what may this indicate?
- Under the conventional arrangement described in the DGT mechanics manual, where is the engine cooling-system thermostat generally located?
- Other conditions being equal, how may tyre pressure below the recommendation for the load affect fuel consumption?
- A driver without specialist training should leave replacement of certain lamps to a workshop because of high-voltage risk. Which lamps does this precaution concern?
- The driver of a lorry with a MAM exceeding 3,500 kg must leave the driving position when parking on a steep upward slope with a kerb. If securing it by resting a steered wheel against the kerb instead of using chocks, which way should the wheels face?
Truck driving techniques
- On a long downhill section in a truck, it is advisable to:
- What are the basic principles on which the driving technique is based?
- While driving a C1 or C truck, continuous observation of the surroundings:
- Before changing lane or starting a maneuver with a truck, it is advisable to:
- To reduce aerodynamic drag while keeping frontal area, speed and air conditions equal, what is desirable for the drag coefficient Cx?
- Before starting a manoeuvre with a C1 or C truck, it is essential 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?
- An ordinary bus and an ordinary rigid lorry enter a narrow passage simultaneously and cannot pass each other. There are no signs, officers or personnel directing passage, and no gradient determining a different priority. If one must reverse, which has priority under the regulatory order?
- Alcohol consumption: what effects can it have on driving your lorry?
- If you drive your lorry having drunk alcohol, but without exceeding the maximum permitted blood alcohol level, does this pose any danger to driving?
- When overtaking a cyclist on an urban road with one lane in each direction, what minimum lateral clearance must you leave and how must you use the adjacent or opposing lane?
- A lorry with a MAM over 3,500 kg travels through a tunnel without intending to overtake. Expressing the minimum gap to the vehicle ahead in metres, as an alternative to a minimum six-second interval, what figure applies?
- If the road narrows or obstacles appear while driving a C1 or C truck, the proper action is to:
- When must drivers of heavy vehicles indicate that they can be overtaken?
- A large vehicle cannot be overtaken easily and safely because of dense opposing traffic. How must its driver help following traffic pass?
- 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?
- A following vehicle intends to overtake you. You are neither turning left nor stopping on that side and can safely move towards the right-hand edge of the carriageway. Must you do so to facilitate overtaking?
- What is the general maximum speed for a lorry on a paved conventional road outside built-up areas, without dangerous goods or another applicable lower limit?
- When moving off from a stop or from the edge of the road with a C1 or C truck, the correct action is to:
- To obtain the C1 licence, the DGT requires:
- Near pedestrians or cyclists, with a C1 or C truck, you must:
- To maintain a gap allowing you to stop without collision if the vehicle ahead brakes suddenly, which set of factors should you consider especially?
- What precaution should you take before and during a permitted reversing manoeuvre to avoid striking a pedestrian?
- You drive in light rain that does not significantly reduce visibility, with no fog, snow, smoke or dust, on a straight road that is not a signed narrow winding section. May you switch on the fog lights because of that rain?
- You drive an ordinary lorry on a motorway with two lanes in your direction, outside a tunnel and without minimum-gap signs. What distance must you keep from the vehicle ahead?
Driving and rest times
- A driver performs goods transport subject to Regulation (EC) 561/2006. Which sequence permits splitting the minimum 45-minute break for a driving period of up to four and a half hours?
- According to Regulation (EC) 561/2006, daily driving time may be extended to 10 hours:
- Aggressive driving with a C1 or C truck:
- A lorry designed primarily to carry goods has a technically permissible maximum laden mass of 8 tonnes. Under the European mass classification, which N category does it belong to?
- According to Regulation (EC) 561/2006, the total accumulated driving time over two consecutive weeks must not exceed:
- If fatigue appears while driving a C1 or C truck, the safest action is to:
- 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?
- If visibility is reduced while driving a C1 or C truck, you must:
- When checking a tachograph, which coefficient represents the vehicle’s output signal over one kilometre, expressed in revolutions/km or impulses/km?
- If you are not in a suitable condition to drive a C1 or C truck, you must:
- In professional transport, respecting breaks and rest periods serves to:
How to pass the C1 licence questions
This bank holds 832 exam-style DGT questions updated for 2026 for the C1 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 C1 licence
- How many questions does the C1 licence theory exam have?
- The C1 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 C1 licence in Spain?
- The minimum age for the Spanish C1 licence is 18. 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 C1 licence?
- With the C1 licence you can drive: Goods vehicles between 3,500 kg and 7,500 kg.
- How many practice simulations should I do before the C1 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.