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An ignition interlock device is a breath-testing system connected to a vehicle that prevents the engine from starting when the driver’s alcohol concentration exceeds the programmed limit.

Before starting the vehicle, the driver provides a breath sample. If the alcohol concentration is below the permitted threshold, the vehicle can be started.

Some systems require additional breath tests during a journey to confirm that the authorised driver remains compliant. The exact procedure depends on the device and applicable rules.

Yes. Many systems can record breath-test results, failed attempts, events and possible attempts to interfere with the device.

Depending on the country, an ignition interlock may be required for drivers convicted of serious or repeated alcohol-related driving offences.

No. Having another person provide the breath sample defeats the purpose of the system and may be treated as tampering or non-compliance under the applicable rules.

A breath test is a preliminary test that detects alcohol in exhaled breath and indicates whether the alcohol level is below or above specified thresholds.

The person blows into a portable breath-testing device, which analyses a sample of exhaled air for alcohol.

No. A breath test is generally a screening test, while a breath analysis provides a more precise measurement of the alcohol concentration in exhaled breath.

Depending on local law, a positive result may be followed by a breath analysis, blood test or other evidential procedure.

In many countries, police may conduct roadside alcohol checks even when a driver does not show obvious signs of impairment. The exact powers vary by country.

Rules vary between countries, but refusing a legally required breath test can itself lead to penalties or an immediate restriction on driving.

A breath analysis measures the concentration of alcohol in exhaled breath using an approved evidential device.

No. A breath test is generally used for preliminary screening, while a breath analysis provides a more precise measured alcohol concentration.

The person blows into an approved breath-analysis device, which measures the alcohol concentration in the exhaled air.

The result is commonly expressed as milligrams of alcohol per litre of exhaled breath. The units and legal thresholds depend on the country.

Depending on local law, the result can lead to a temporary driving prohibition, fine, licence restriction or court proceedings.

In some countries, the person may have a right to a second breath analysis, blood test or other counter-analysis. The procedure depends on local law.

Blood alcohol content (BAC) measures the concentration of alcohol in a person’s blood and is used to assess alcohol consumption and legal driving limits.

BAC can be expressed as a percentage, grams of alcohol per litre of blood or parts per thousand (‰). The units commonly used depend on the country.

A BAC of 0.5‰ means 0.5 grams of alcohol per litre of blood, which is equivalent to 0.05% BAC.

No. BAC measures alcohol in the blood, while a breath test or breath analysis measures alcohol in exhaled air. Legal systems may establish corresponding limits for both measurements.

No. BAC can be influenced by factors such as body composition, sex, the amount and speed of drinking, food intake and the time since alcohol was consumed.

Yes. Alcohol can impair driving ability before the legal limit is reached. Being below the legal BAC limit does not guarantee that a person is safe to drive.

An alcohol blood test measures the concentration of alcohol in a blood sample and provides a blood alcohol concentration (BAC).

A blood test measures alcohol directly in the blood, while a breath analysis measures alcohol in exhaled breath. Both can be used to determine whether a legal alcohol limit has been exceeded.

A blood sample used for legal testing is normally taken by an authorised healthcare professional and analysed according to an approved procedure.

Depending on local law, a blood test may be used when breath testing cannot be performed, after certain accidents or as a counter-analysis of a breath result.

Blood alcohol concentration is commonly expressed as grams of alcohol per litre of blood, parts per thousand (‰) or a percentage, depending on the country.

Yes. In countries where a blood sample can lawfully be required, refusing without a legally accepted reason may itself be an offence.

A saliva test is a screening test that uses oral fluid to detect the recent presence of certain drugs or their metabolites.

A sample of saliva is collected from inside the mouth and tested using an approved portable device. The exact procedure and substances tested depend on the country.

No. A saliva test is generally a preliminary roadside screening, while a saliva analysis is a laboratory examination used to confirm and measure specified substances more precisely.

Depending on local law, a positive result can lead to a saliva analysis, blood test, temporary driving prohibition or further legal proceedings.

No. Saliva tests are designed to detect specific substances. The drugs included and the detection thresholds depend on the testing device and applicable law.

Rules vary between countries, but refusing a legally required saliva test can itself lead to penalties or an immediate restriction on driving.

Drugs can impair concentration, perception, reaction time, coordination and judgement. The effects depend on the substance, dose, individual and whether other substances are also present.

Yes. Cannabis can affect attention, reaction time, coordination and perception, which can make driving unsafe.

Yes. Stimulants can cause overconfidence, agitation, impulsive behaviour and reduced judgement, while their effects may later be followed by fatigue or reduced concentration.

Yes. Some substances can continue to affect alertness, coordination or judgement after the strongest effects appear to have passed.

Yes. Combining substances can produce stronger or unpredictable impairment and significantly increase the risk of a crash.

Depending on the country, police may use behavioural observations, saliva tests, saliva analyses or blood tests to detect specified substances.

No. Some countries prohibit driving above specified drug concentrations, while others focus on impairment or the presence of certain substances. Testing procedures and penalties also vary.

Yes. Some medicines can cause drowsiness, dizziness, blurred vision, slower reactions or reduced concentration, which can make driving unsafe.

Yes. A medicine can be legally prescribed and still impair your ability to drive safely. Follow the instructions provided by your doctor, pharmacist and patient information leaflet.

Yes. Medicines available without a prescription can also affect driving. Some antihistamines, cough medicines and other common products may cause drowsiness or other side effects.

Read the patient information leaflet, especially the section about driving and using machines, and ask a doctor or pharmacist if you are unsure.

Be especially cautious when starting a new medicine or changing the dose, because you may not yet know how it affects your alertness, coordination or judgement.

Yes. Alcohol can interact with some medicines and increase drowsiness, dizziness or other impairing effects. Follow the medicine instructions and professional medical advice.

A traffic penalty is a legal consequence imposed when a road user violates an applicable traffic law or regulation.

Penalties can include fines, penalty points, driving bans, licence suspension, vehicle restrictions and court proceedings. The available sanctions depend on the country.

Generally, yes. Traffic systems often apply heavier penalties to offences that create greater danger, involve excessive speed, impaired driving or repeated violations.

Yes. Many countries apply stronger sanctions to repeat offenders, such as higher fines, longer driving bans or mandatory rehabilitation measures.

Yes. Serious offences can result in a temporary or longer disqualification from driving, depending on the applicable law and circumstances.

No. Fine amounts, penalty-point systems, driving bans and enforcement procedures vary between countries.

Speeding means driving faster than the applicable maximum speed limit.

Higher speeds reduce reaction time, increase stopping distance and increase the severity of a collision.

Yes. A speed limit is normally a maximum. Drivers may need to drive more slowly because of traffic, weather, visibility or road conditions.

Authorities may use fixed or mobile speed cameras, radar, laser equipment, average-speed checks or police measurements, depending on the country.

Usually, yes. Many countries impose higher fines or additional penalties for larger speed-limit violations.

Yes. Serious or repeated speeding offences can lead to a driving ban, licence suspension or court proceedings, depending on local law.

Yes. Lighting, holding or extinguishing a cigarette can create manual and visual distraction, while smoke or dropped ash can also interfere with concentration.

This depends on the country. Some countries allow smoking while driving but prohibit it when children are present or in certain types of vehicles.

Smoking in an enclosed vehicle exposes passengers to second-hand smoke, and children are particularly vulnerable to its harmful effects.

In some countries, yes. Laws may treat vaping or electronic cigarettes in the same way as smoking when restricting their use inside vehicles.

Heavy smoke inside a vehicle can reduce comfort and visibility, while smoke residue can also create a film on the windscreen and windows that increases glare.

Yes. A discarded cigarette can create litter, distract other road users or start a fire, particularly in dry vegetation.

A traffic enforcement camera is a camera system used to detect or record traffic violations for enforcement purposes.

Depending on the system, cameras can detect speeding, red-light violations, prohibited lane use, insufficient following distance and other traffic offences.

A speed camera measures the speed of vehicles at a particular location and can record vehicles exceeding the applicable speed limit.

A red-light camera records vehicles that pass a traffic signal after it has turned red. Some systems can also measure vehicle speed.

Yes. Section control uses cameras at multiple points to calculate a vehicle's average speed over a defined road section rather than measuring speed at a single location.

No. Some cameras are used only for traffic monitoring, traffic management or incident detection. A traffic camera is therefore not necessarily an enforcement camera.

Stop and make the scene as safe as possible. Warn approaching traffic, check whether anyone is injured and call the emergency services when necessary.

This depends on the circumstances and local law. After a minor collision with no injuries, vehicles may need to be moved out of the traffic flow when it is safe. After a serious injury accident, they may need to remain in place for investigation.

Drivers commonly exchange names, contact details, vehicle information and insurance details. The exact legal requirements vary between countries.

Police should generally be contacted when there are injuries, serious damage, disagreement, suspected offences or difficulty identifying the people involved. Local reporting rules may require police involvement in additional situations.

An accident report form records information about the vehicles, drivers, damage and circumstances of a collision and can help insurers process the claim.

Drivers and other involved persons are normally required to stop and fulfil their legal duties. Leaving without doing so may constitute a serious offence such as hit-and-run.

Make the scene as safe as possible, call the emergency services when necessary and provide assistance within your abilities. Follow instructions given by emergency operators or trained responders.

Generally, avoid moving a seriously injured person unless they face an immediate danger from traffic, fire or another hazard. Unnecessary movement can worsen certain injuries.

Do not routinely remove a helmet from an injured motorcyclist. Helmet removal may require special care, particularly when a head, neck or spinal injury is possible. Follow emergency-service instructions unless immediate action is necessary to preserve life.

Yes. Internal injuries, concussion and other trauma may not be immediately visible. Seek medical assistance when there is concern about the person's condition.

Give the exact location, what happened, the number of injured people and any immediate dangers. Stay on the line and follow the operator's instructions.

Provide first aid that you are trained and able to give safely. Do not put yourself or others in additional danger, and follow professional instructions whenever possible.

Stop at a safe place as soon as possible. Sit upright, lean slightly forward and pinch the soft part of the nose continuously for about 10–15 minutes.

No. Keep your head slightly forward so blood does not run into the throat, where it can cause choking, coughing or vomiting.

Pinch the soft part of the nose continuously for about 10–15 minutes before checking whether the bleeding has stopped.

Seek medical help if the bleeding is heavy, does not stop after sustained pressure, follows a significant head or facial injury, causes weakness or dizziness, or makes breathing difficult.

Only if the bleeding has stopped and you feel fully able to drive safely. If the nosebleed distracts you, affects visibility or makes you feel weak or unwell, stop and do not continue until it is safe.

Yes. Medicines that reduce blood clotting can make bleeding more difficult to stop. Seek medical advice if bleeding persists or you are concerned.

Material damage is damage to vehicles, road infrastructure, buildings or other property without bodily injury.

Make the scene safe, exchange the required details, record the damage and circumstances and follow the applicable insurance and reporting rules.

Yes. Photos of the vehicles, damage, road position, signs and surrounding area can help document what happened and support an insurance claim.

Only if the vehicle remains safe and roadworthy. Do not continue driving if the damage affects steering, brakes, tyres, lights, visibility or another safety-critical component.

Usually, yes. Insurance policies commonly require an accident or claim to be reported as soon as possible. The exact procedure and deadline depend on the country and policy.

You should follow local rules for identifying yourself and reporting the damage. Leaving without providing the required information can lead to legal consequences.

If possible, move the vehicle to a safe place away from moving traffic, switch on the hazard warning lights and warn approaching road users.

This depends on the location and danger. On high-speed roads, it is often safer to leave the vehicle carefully and wait behind a safety barrier or another protected place when this can be done safely.

Many countries require or recommend a warning triangle when a broken-down vehicle creates a danger or obstruction. The required distance and conditions vary by country.

In many countries, a high-visibility or reflective vest is required or recommended when leaving a broken-down vehicle near traffic. Check the local rules.

Only when it can be done safely. Do not attempt repairs if they expose you to moving traffic or another serious hazard. Roadside assistance is often the safer option.

Contact roadside assistance when the vehicle cannot continue safely. Call the emergency services when there is immediate danger, injury, fire or another emergency.

A warning triangle is a portable reflective device placed on the road to warn approaching traffic about a stopped vehicle, accident or other hazard.

It is generally used when a vehicle is broken down, involved in an accident or creating an obstruction. The exact legal requirements vary between countries.

The required distance depends on the country and type of road. Higher-speed roads usually require the triangle to be placed farther away so approaching drivers have more time to react.

Place it where it is clearly visible to approaching traffic and where doing so does not put you in unnecessary danger.

Often, yes. Hazard warning lights and a warning triangle can work together to make a stopped vehicle more visible. The legal requirements vary by country.

Yes. It is useful to keep it accessible without having to unload large amounts of luggage, especially because it may be needed quickly in a dangerous roadside situation.

Traffic rules are laws and regulations that determine how drivers, cyclists, pedestrians and other road users must behave on the road.

Traffic rules help organise traffic, prevent conflicts and reduce the risk of accidents by making the behaviour of road users more predictable.

No. Traffic rules vary between countries and can differ in areas such as speed limits, priority, parking, overtaking and permitted road use.

Traffic rules are the laws governing road use, while traffic signs communicate specific warnings, restrictions, obligations or information to road users.

No. Traffic rules can apply to drivers, cyclists, pedestrians, motorcyclists and other road users, depending on the rule and type of road.

Temporary signs and authorised traffic directions can change how traffic must behave at a particular location. Road users must follow the applicable signs, signals and authorised instructions according to local law.

A driving school provides professional instruction to help learner drivers prepare for their theory and practical driving examinations.

Training can include traffic rules, road signs, vehicle control, observation, manoeuvres, hazard awareness and driving safely in normal traffic.

This depends on the country, licence category and chosen training route. Some learners may practise privately, while others must complete a minimum number of professional lessons.

No. A driving school provides training, while an exam centre officially assesses whether the candidate meets the requirements for a driving licence.

Often, yes. When a candidate takes the practical exam through a driving school, the school may book the appointment and provide the examination vehicle, depending on local rules.

Choose an authorised or recognised driving school where required, and compare factors such as instructor qualifications, training options, availability and cost.