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QuizTraffic rulesThailand

Test your knowledge with our multiple-choice quiz. Learn from each answer and improve your understanding of the traffic rules and road signs of Thailand.

For informational purposes only. Always follow official regulations. Some content and images were created with AI assistance.

Traffic signs
Traffic rules
Thailand
True/false 17 Thailand 17 Car controls 109 Dashboard lights 40 Priority rules 9 Pedestrians 19 Cyclists 20 Show all 584
What should you do if steam begins coming from underneath the bonnet?

351. What should you do if steam begins coming from underneath the bonnet?

Open the coolant cap to release the pressure.
Keep the engine running so the cooling system keeps working.
✓ Stop safely, switch off the engine, and keep clear until it has cooled.
Continue driving slowly until the steam stops.

Steam can indicate an overheated and pressurised cooling system. Do not remove the coolant cap while the system is hot.

Steam rising from underneath a vehicle's bonnet
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is important when raising a vehicle with its jack?

352. What is important when raising a vehicle with its jack?

✓ Use the correct jacking point and never go underneath a vehicle on a jack.
Use any solid-looking part underneath the vehicle.
Place the jack on soft ground to prevent floor damage.
Raise the vehicle before applying the parking brake.

A jack can slip or fail if it is incorrectly positioned. Secure the vehicle and use additional approved supports before working underneath it.

Vehicle raised at a jacking point for a wheel change
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Should motorcyclists wear protective clothing?

353. Should motorcyclists wear protective clothing?

No, it is only useful when riding at high speeds.
✓ Yes, it can reduce injuries from falls and contact with the road.
No, a helmet provides enough protection on its own.
Yes, but only when riding on motorways.

Motorcyclists should wear protective clothing because it can reduce injuries from falls, impacts and sliding on the road. Suitable jackets, trousers, gloves and boots provide additional protection, but they do not replace a securely fitted helmet or safe riding.

Motorcyclist wearing protective riding clothing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when meeting another vehicle on a narrow mountain road?

354. What should you do when meeting another vehicle on a narrow mountain road?

Move toward the centre so the other driver gives way.
Stop where the road is narrowest and wait.
✓ Slow down and use a safe passing place if necessary.
Maintain speed and pass as closely as possible.

Narrow mountain roads may not provide enough space for two vehicles. Reduce speed and cooperate to pass safely.

Vehicles meeting on a narrow mountain road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you normally select before leaving an automatic vehicle parked?

355. What should you normally select before leaving an automatic vehicle parked?

R (Reverse).
D (Drive).
✓ P (Park).
N (Neutral).

Select P (Park) before leaving an automatic vehicle parked. Park locks the transmission to help prevent the vehicle from rolling; the parking brake should also be applied.

Park position on an automatic gear selector
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Does opening a window make an alcohol-impaired driver safe?

356. Does opening a window make an alcohol-impaired driver safe?

✓ No, fresh air does not remove alcohol from the body.
Yes, because fresh air helps you sober up.
Yes, if you feel more awake afterwards.
Yes, if you also drink some water.

Fresh air may make someone feel more awake, but it does not reduce their alcohol concentration or restore safe driving ability.

Open car window and an alcohol-impaired driver
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when approaching a temporary lane closure?

357. What should you do when approaching a temporary lane closure?

Merge without checking if traffic is moving slowly.
✓ Follow the temporary signs and merge safely when required.
Follow construction vehicles through the closed lane.
Ignore the temporary signs if your lane is still open.

Observe the temporary signs, adjust your speed, and merge safely according to the traffic situation and local rules.

Temporary traffic-lane closure ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you use your indicator before turning?

358. Why should you use your indicator before turning?

✓ To show other road users what you plan to do.
To show that the turn is safe to make.
To replace checking mirrors and blind spots.
To give yourself priority over other traffic.

Indicators help other drivers, cyclists, and pedestrians understand your intentions in time.

Vehicle indicator signalling an intended turn
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when a bus signals to pull away from a bus stop?

359. What should you do when a bus signals to pull away from a bus stop?

Accelerate and pass before the bus moves out.
✓ Slow down and be prepared to let it move out when safe.
Ignore the signal until the bus starts moving.
Sound your horn so the bus waits for you.

Buses may pull away after picking up passengers. Slow down, check the traffic situation, and allow space when it is safe.

Bus signalling to pull away from a stop
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when crossing a road with no marked crossing nearby?

360. What should you do when crossing a road with no marked crossing nearby?

Cross between parked vehicles if traffic seems quiet.
Cross near a bend if approaching traffic seems slow.
Cross diagonally to spend less time in each lane.
✓ Choose a place with a clear view in both directions.

If there is no marked crossing nearby, choose a safe place where you can clearly see approaching traffic.

Pedestrian preparing to cross a road without a marked crossing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if birds are swooping at you while cycling?

361. What should you do if birds are swooping at you while cycling?

Wave your arms to frighten the birds away.
Accelerate as fast as possible to escape.
✓ Slow down, stay calm, and leave the area without provoking them.
Throw objects towards the birds.

Some birds become territorial during the breeding season and may swoop people near their nests. Stay calm, avoid provoking or approaching the birds, and leave the area safely. If necessary and safe, dismount and walk your bicycle through or away from the area while keeping your helmet on.

Bird swooping near a cyclist
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does the ACC position of a traditional ignition switch normally allow?

362. What does the ACC position of a traditional ignition switch normally allow?

The transmission to select Drive.
The starter motor to turn the engine.
✓ Electrical accessories to be used without starting the engine.
The parking brake to release.

The ACC (accessory) position normally supplies power to certain electrical accessories, such as the audio system, without starting the engine. The exact functions available can vary between vehicles.

ACC accessory position on an ignition switch
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Does driving at the speed limit always mean your speed is safe?

363. Does driving at the speed limit always mean your speed is safe?

Yes, if the road ahead appears clear.
Yes, if your vehicle is in good condition.
✓ No, you may need to drive more slowly for the conditions.
Yes, the speed limit is always the safest speed.

A speed limit is a maximum permitted speed, not a target. You may need to drive more slowly because of traffic, poor visibility, weather, road conditions, pedestrians, cyclists, or other hazards.

Speed-limit sign and changing road conditions
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if a direction indicator does not cancel after a turn?

364. What should you do if a direction indicator does not cancel after a turn?

✓ Return the indicator control to its neutral position.
Press the horn.
Switch on the hazard warning lights.
Leave it flashing until the next turn.

Direction indicators often cancel automatically after a turn, but if an indicator remains on, return the indicator control to its neutral position so you do not mislead other road users.

Returning the indicator stalk to its neutral position
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How can air conditioning help demist the windows?

365. How can air conditioning help demist the windows?

By opening the windows automatically.
By heating the rear window directly.
By increasing air recirculation.
✓ By removing moisture from the air.

Using the air conditioning can help demist the windows because it removes moisture from the cabin air. Directing this drier air towards the windscreen can clear condensation more quickly.

Air-conditioning controls used to demist the windscreen
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid wearing dark clothing at night?

366. Why should you avoid wearing dark clothing at night?

Headlights make clothing colour unimportant.
✓ Drivers may have difficulty seeing you.
Clothing colour matters only on unlit roads.
Street lighting makes dark clothing easy to see.

Dark clothing makes pedestrians harder to see in low-light conditions. Bright or reflective clothing improves visibility.

Pedestrian wearing dark clothing at night
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if medicine makes you feel drowsy?

367. What should you do if medicine makes you feel drowsy?

Drive slowly and avoid motorways.
Drink coffee before driving.
✓ Do not drive until the effect has passed.
Drive only for short distances.

If a medicine causes drowsiness, your concentration, judgement, and reaction time may be reduced. Do not drive until you are fit to do so and the effect has passed.

Drowsiness after taking medicine
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What can slow engine cranking or dim lights indicate?

368. What can slow engine cranking or dim lights indicate?

Worn brake pads.
A wheel-alignment problem.
✓ A weak battery or charging-system problem.
A blocked air filter.

Slow starting, dim lights, or repeated battery warnings can indicate a weak battery, poor electrical connection, or a fault in the charging system.

Vehicle battery and difficulty starting the engine
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you check before beginning a journey in severe winter weather?

369. What should you check before beginning a journey in severe winter weather?

Check whether other vehicles are using the roads.
✓ The weather, road conditions, tyres, fuel or charge, and emergency supplies.
Nothing extra if the vehicle has winter tyres.
Only whether you have enough fuel or charge.

Check whether the journey is necessary and prepare for delays or changing conditions. Suitable tyres, sufficient fuel or charge, warm clothing, and basic emergency supplies may be important.

Preparing a vehicle for a winter journey
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

370. What does this vehicle-control symbol indicate?

Electric window control.
Central door locking.
Seat adjustment.
✓ Exterior mirror adjustment.

This control adjusts the vehicle's exterior mirrors. The driver normally selects the left or right mirror and then moves the control to change its angle.

Control for adjusting the exterior mirrors
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why is it dangerous to cross between parked cars?

371. Why is it dangerous to cross between parked cars?

You cannot hear approaching traffic between cars.
Pedestrians lose priority when crossing between cars.
Traffic always moves faster beside parked cars.
✓ Drivers may not see you or expect you to cross.

Parked vehicles can block the view between pedestrians and drivers. This makes it harder to see approaching traffic and harder for drivers to see you.

Pedestrian crossing between parked cars
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if you have taken drugs that may impair your driving?

372. What should you do if you have taken drugs that may impair your driving?

Wait until you feel more confident.
Drive slowly and avoid motorways.
Drink coffee before driving.
✓ Do not drive.

Drugs can impair judgement, coordination, concentration, and reaction time. Their effects can be unpredictable and may continue after you feel that the main effects have passed. Do not drive while impaired.

Drug impairment and the decision not to drive
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you keep your windscreen clean?

373. Why should you keep your windscreen clean?

To reduce fuel consumption.
To make the headlights brighter.
✓ To see the road clearly.
To improve engine cooling.

A clean windscreen gives you a clear view of the road, signs, pedestrians, cyclists, and other vehicles.

Cleaning a windscreen to improve the driver's view
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You may ignore a stop sign if the road looks empty.

374. You may ignore a stop sign if the road looks empty.

True.
✓ False.

A stop sign means you must come to a complete stop, even if no other traffic is visible.

Stop sign at a quiet junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if an emergency vehicle approaches with lights or siren on?

375. What should you do if an emergency vehicle approaches with lights or siren on?

Speed up so the vehicle can follow you.
Move aside without checking surrounding traffic.
Ignore it if there is not enough room to pass.
✓ Stay calm and make room safely.

When an emergency vehicle uses lights or siren, check your surroundings and make room safely without sudden or dangerous movements.

Emergency vehicle approaching with warning lights flashing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before using a pedestrian crossing?

376. What should you do before using a pedestrian crossing?

Cross as soon as the nearest vehicle starts slowing down.
Rely on the crossing markings to make every vehicle stop.
Check only the lane nearest to you before crossing.
✓ Make sure it is safe to cross.

Even at a pedestrian crossing, make sure approaching drivers have seen you and are able to stop before you cross.

Pedestrian checking traffic before using a crossing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Using indicators helps other road users understand your intentions.

377. Using indicators helps other road users understand your intentions.

✓ True.
False.

Indicators help communicate your intended direction and improve safety for everyone on the road.

Vehicle signalling its intended direction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when passing a horse rider?

378. What should you do when passing a horse rider?

Sound your horn so the rider knows you are passing.
✓ Slow down and give plenty of space.
Accelerate while passing to get past quickly.
Pass closely to reduce the time beside the horse.

Horses can be startled by noise or sudden movement. Slow down, pass carefully, and leave enough space.

Vehicle passing a horse and rider
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do first after a collision?

379. What should you do first after a collision?

Discuss who caused the collision before calling for help.
✓ Stop, check for danger and injuries, and call for help if needed.
Continue driving if the vehicles can still move.
Check the vehicle damage before checking for injuries.

Stop the vehicle, warn other traffic where appropriate, assess immediate danger and injuries, and contact the emergency services when needed. Exchange any details required by local law.

Vehicles stopped after a road collision
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you reduce speed in residential areas?

380. Why should you reduce speed in residential areas?

Because residential roads are usually more slippery.
✓ Pedestrians, cyclists, and children may be nearby.
Traffic from side roads must always give way.
Overtaking is prohibited throughout residential areas.

Residential areas often have pedestrians, cyclists, parked vehicles, driveways, and children, and hazards may appear suddenly. Lower speed gives you more time to react and stop safely.

Vehicle travelling through a residential street
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if a large animal suddenly enters your path?

381. What should you do if a large animal suddenly enters your path?

Accelerate to pass before the animal moves.
Turn suddenly toward the roadside.
Release the steering wheel and brake hard.
✓ Brake firmly while keeping control of the vehicle.

If a large animal enters the road, brake firmly while keeping the vehicle under control. Avoid sudden swerving, as this can cause you to lose control or collide with other traffic.

Large animal entering a vehicle's path
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which foot should normally operate the brake and accelerator in an automatic vehicle?

382. Which foot should normally operate the brake and accelerator in an automatic vehicle?

Both feet together.
The left foot.
Either foot at the same time.
✓ The right foot.

In an automatic vehicle, the right foot should normally operate both the brake and accelerator pedals. The left foot should rest on the footrest to reduce the risk of pressing both pedals at the same time.

Right-foot control of an automatic vehicle's pedals
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

383. What does this dashboard symbol indicate?

Charging-system warning.
Oil-pressure warning.
✓ Engine-temperature warning.
Low washer fluid.

This symbol indicates that the engine coolant temperature is too high. If it illuminates while driving, stop safely and allow the engine to cool before investigating the cause.

Engine-temperature warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if you smell fuel or see fuel leaking from your vehicle?

384. What should you do if you smell fuel or see fuel leaking from your vehicle?

Wash the leaking fuel away with water.
✓ Stop, switch off the engine, avoid flames or sparks, and call for assistance.
Restart the engine to check whether the leak continues.
Ignore a small leak if the fuel level remains stable.

Leaking fuel creates a serious fire risk. Keep people away, do not restart the engine, and arrange professional assistance.

Fuel leaking from a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you use headlights in poor visibility?

385. Why should you use headlights in poor visibility?

To make the brakes respond faster.
✓ To see better and be seen by others.
To reduce fuel consumption.
To prevent the tyres from slipping.

Headlights help you see the road and make your vehicle more visible to other road users in fog, rain, darkness, or poor weather.

Vehicle using headlights in reduced visibility
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid using air recirculation for too long in damp conditions?

386. Why should you avoid using air recirculation for too long in damp conditions?

✓ It can cause the windows to mist.
It can switch off the air conditioning.
It can reduce tyre pressure.
It can overheat the engine.

Using air recirculation for too long in damp conditions can allow moisture to build up inside the vehicle and increase window misting, especially when the air conditioning is not dehumidifying the air. Switching to fresh outside air can help clear condensation.

Air-recirculation setting and misted vehicle windows
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you not rely only on a reversing camera?

387. Why should you not rely only on a reversing camera?

✓ It may not show everything around the vehicle.
It makes mirrors unnecessary when reversing.
It shows every blind spot around the vehicle.
It guarantees that the path behind is clear.

Reversing cameras can help, but they may have blind spots and limited coverage. Always check your mirrors and surroundings, look around where possible, and reverse slowly.

Reversing-camera display inside a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if the windscreen wipers leave the glass smeared?

388. What should you do if the windscreen wipers leave the glass smeared?

Use the wipers at a higher speed.
Replace the washer pump instead of the blades.
✓ Clean the windscreen and blades, and replace worn blades.
Apply lubricant to the wiper blades.

Worn or dirty wiper blades can seriously reduce visibility in rain. Clean them first and replace them if they remain ineffective or damaged.

Wiper streaks on a vehicle's windscreen
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What do the + and − controls normally adjust when the speed limiter is active?

389. What do the + and − controls normally adjust when the speed limiter is active?

The engine idle speed.
The transmission gear.
✓ The selected maximum speed.
The following distance.

When the speed limiter is active, the + and − controls normally increase or decrease the selected maximum speed. The exact adjustment steps can vary between vehicles.

Plus and minus controls for the speed limiter
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why is riding a bicycle after drinking alcohol dangerous?

390. Why is riding a bicycle after drinking alcohol dangerous?

A small amount of alcohol improves balance.
A helmet protects you from alcohol-related risks.
Cycling after drinking is safe on quiet roads.
✓ Alcohol can reduce your balance, coordination, judgement, and reaction time.

Alcohol can make it harder to balance, steer, judge distances, and react to hazards. Riding a bicycle while impaired may also be against the law.

Alcohol consumption and bicycle-riding safety
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
It is safe to look at your phone briefly while driving.

391. It is safe to look at your phone briefly while driving.

True.
✓ False.

Using your phone while driving is distracting and dangerous, even for a very short moment.

Driver glancing at a phone while driving
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid stopping in a blind spot of a large vehicle?

392. Why should you avoid stopping in a blind spot of a large vehicle?

Large vehicles always have priority when changing lanes.
Blind spots only matter when a vehicle is reversing.
✓ The driver may not be able to see you.
Stopping beside a large vehicle makes you easier to see.

Large vehicles have bigger blind spots. If you stop where the driver cannot see you, you may be at risk when the vehicle moves or turns.

Vehicle positioned in a large vehicle's blind spot
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

393. What does this dashboard symbol indicate?

✓ Engine-management warning.
Oil-pressure warning.
Charging-system warning.
Diesel particulate filter warning.

This symbol indicates a fault detected by the engine-management or emissions-control system. If it remains illuminated while driving, the vehicle should be checked according to the manufacturer's instructions.

Engine-management warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when traffic lights are not working?

394. What should you do when traffic lights are not working?

Proceed if the junction appears clear.
✓ Proceed carefully and follow signs or priority rules.
Wait for another driver to enter first, then follow.
Follow the vehicle ahead through the junction.

If traffic lights are not working, slow down, observe carefully, and follow signs, road markings, or local priority rules.

Junction with traffic lights out of operation
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you avoid if your vehicle loses grip on a wet road?

395. What should you avoid if your vehicle loses grip on a wet road?

✓ Sudden braking or sharp steering.
Easing off the accelerator gradually.
Looking ahead and staying alert.
Holding the steering wheel firmly.

Abrupt inputs can upset the vehicle further. Smooth control gives the tyres a better chance to regain grip.

Vehicle losing grip on a wet road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you leave a broken-down vehicle when traffic is passing nearby?

396. How should you leave a broken-down vehicle when traffic is passing nearby?

✓ Use the door furthest from moving traffic when it is safe to do so.
Leave through the door nearest moving traffic.
Walk around the vehicle on the traffic side.
Get out immediately without checking for traffic.

Leaving through the side away from traffic reduces the risk of being struck by a passing vehicle.

Leaving a broken-down vehicle away from passing traffic
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

397. What does this dashboard symbol indicate?

Dipped headlights.
Front fog lights.
✓ Rear fog lights.
Sidelights.

This symbol indicates that the rear fog lights are switched on. Rear fog lights make the vehicle more visible from behind in conditions of severely reduced visibility, but they can dazzle other road users when used unnecessarily.

Rear fog-light symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is a danger of driving a petrol or diesel vehicle with the boot or tailgate open?

398. What is a danger of driving a petrol or diesel vehicle with the boot or tailgate open?

The vehicle can become too heavy at the rear.
The rear window demister may stop working.
✓ Exhaust fumes can be drawn into the passenger compartment.
The boot warning light may remain on.

Driving with the boot or tailgate open can allow exhaust gases to be drawn into the vehicle. Exhaust fumes may contain carbon monoxide, which is poisonous and may be difficult to detect. Keep the luggage compartment properly closed while driving whenever possible.

Open vehicle tailgate and exhaust-fume risk
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you check before starting a bicycle journey?

399. What should you check before starting a bicycle journey?

Only the brakes if the journey is short.
The lights, but not the steering or brakes.
Nothing if the bicycle worked properly yesterday.
✓ The brakes, tyres, lights, and steering.

A basic safety check can reveal problems with the brakes, tyres, lights, or steering before they cause an accident.

Checking a bicycle before a journey
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How can a roof load affect vehicle handling?

400. How can a roof load affect vehicle handling?

It affects only fuel consumption, not handling.
It makes the vehicle more stable in bends.
✓ It can raise the centre of gravity and reduce stability.
It lowers the vehicle's centre of gravity.

Weight carried high on the vehicle can increase body movement and make sudden steering or cornering less stable.

Vehicle carrying a raised roof load
AI-generated by Traffic-rules.com • WCIT • CC BY-SA