Support us

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
Which road markings should you follow through roadworks?

401. Which road markings should you follow through roadworks?

Follow the old permanent markings if they are still visible.
Use the markings intended for construction vehicles.
✓ The temporary markings that show the current traffic route.
Use whichever markings give you the shortest route.

Temporary road markings may replace the normal lane layout during roadworks. Follow the markings and signs that currently guide traffic.

Temporary road markings through a roadworks area
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How can a heavy load affect stopping distance?

402. How can a heavy load affect stopping distance?

It makes the brakes respond more quickly.
It reduces the driver's reaction time.
It affects stopping distance only on steep roads.
✓ It can increase the distance needed to stop.

A heavily loaded vehicle has more mass and may require additional distance to slow down or stop safely.

Loaded vehicle and the space needed for braking
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should a motorcyclist react to grooves or ruts in the road?

403. How should a motorcyclist react to grooves or ruts in the road?

Make quick steering corrections as the bike moves.
Accelerate sharply to cross them quickly.
Brake hard while riding through them.
✓ Reduce speed and keep a relaxed, steady grip.

Longitudinal grooves or ruts can affect a motorcycle's steering and may make the wheels follow the uneven surface. Reduce speed where necessary, keep a relaxed but steady grip and avoid sudden braking, acceleration or steering corrections.

Motorcyclist approaching grooves in the road surface
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

404. What does this dashboard symbol indicate?

✓ Low windscreen washer fluid.
Low tyre pressure.
Low coolant level.
Engine-temperature warning.

This symbol indicates that the windscreen washer fluid level is low. Refill the washer-fluid reservoir with suitable fluid when possible.

Low washer-fluid warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if a child runs onto the road ahead?

405. What should you do if a child runs onto the road ahead?

Accelerate to pass before the child moves further into the road.
Swerve immediately into the opposite lane.
✓ Brake firmly and be prepared to stop.
Sound your horn and continue driving.

Children can act unpredictably. Brake firmly, stay alert, and be prepared for more children to follow.

Child entering the road ahead of a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if the charging-system warning light comes on?

406. What should you do if the charging-system warning light comes on?

Continue driving until the battery is completely discharged.
✓ Reduce electrical use, stop safely, and seek assistance.
Switch on more electrical systems to test the battery.
Restart the engine repeatedly to reset the warning.

The alternator or charging system may have failed. The vehicle may stop once the remaining battery charge is exhausted.

Charging-system warning illuminated on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

407. What does this dashboard symbol indicate?

ABS fault.
Parking brake applied.
✓ Brake-pad wear warning.
Brake-system fault.

This symbol indicates that the brake pads may be worn and should be inspected. Continuing to drive with excessively worn brake pads can reduce braking performance and damage other brake components.

Brake-pad wear warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You do not need to look for cyclists when opening your car door.

408. You do not need to look for cyclists when opening your car door.

True.
✓ False.

You should always check for cyclists, motorcyclists, and other road users before opening a door.

Cyclist near the door of a parked car
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should loose items inside a vehicle be secured?

409. Why should loose items inside a vehicle be secured?

They can make the engine overheat.
✓ They can become dangerous projectiles during sudden braking or a collision.
They can increase the vehicle's fuel consumption.
They can interfere with the vehicle's exterior lights.

Loose objects can move or be thrown forwards during sudden braking or a collision. Secure luggage and other items so they cannot injure occupants or interfere with the driver or vehicle controls.

Loose luggage and objects inside a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

410. What does this dashboard symbol indicate?

Sidelights.
✓ Direction indicators.
Main beam.
Hazard warning lights.

This symbol indicates that a direction indicator is operating. The flashing indicator shows the direction in which the driver intends to turn or change position on the road.

Direction-indicator symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you obey traffic signs?

411. Why should you obey traffic signs?

✓ To improve safety for everyone.
To make sure you always have priority.
To avoid checking for other road users.
To let you drive at the maximum permitted speed.

Traffic signs help organise traffic and improve safety for drivers, cyclists, and pedestrians.

Traffic signs using Vienna-style designs
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do with the ignition key once the engine starts?

412. What should you do with the ignition key once the engine starts?

✓ Release it so it returns from START to ON.
Remove it from the ignition.
Keep holding it in the START position.
Turn it immediately to ACC.

Once the engine starts, release the ignition key so it returns from START to the ON position. Holding the key in START unnecessarily can keep the starter motor engaged.

Releasing the ignition key after the engine starts
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when approaching an uncontrolled junction?

413. What should you do when approaching an uncontrolled junction?

Rely on the priority rule without reducing your speed.
✓ Slow down, look carefully in all directions, and proceed only when safe.
Continue at normal speed unless another vehicle is visible.
Check only the direction from which traffic usually has priority.

At an uncontrolled junction, priority may not be obvious. Reduce speed, check carefully, and only enter when you are sure it is safe.

Vehicle approaching an uncontrolled junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which pedal is used to increase the vehicle's speed?

414. Which pedal is used to increase the vehicle's speed?

The brake pedal.
The footrest.
✓ The accelerator pedal.
The clutch pedal.

The accelerator pedal controls the amount of power delivered by the engine and is used to increase or maintain the vehicle's speed. It is the right-hand pedal.

Accelerator pedal in the driver's footwell
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Where should you normally wait after a breakdown on a high-speed road?

415. Where should you normally wait after a breakdown on a high-speed road?

Between the vehicle and the safety barrier.
In front of the vehicle while facing approaching traffic.
Immediately behind the vehicle so you remain visible.
✓ Behind a safety barrier and well away from the vehicle and traffic.

A stationary vehicle can be struck by passing traffic. Waiting behind a barrier provides better protection.

People waiting behind a safety barrier after a breakdown
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if an animal is standing on the road at night?

416. What should you do if an animal is standing on the road at night?

Switch off your headlights as you approach.
Flash your headlights repeatedly to make it move.
✓ Slow down and be prepared to stop.
Drive around it immediately without slowing down.

Animals may freeze, turn back, or move unpredictably when caught in vehicle headlights.

Animal standing on a road at night
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

417. What does this dashboard symbol indicate?

Front fog lights.
✓ Main beam.
Dipped headlights.
Rear fog lights.

This symbol indicates that the main beam headlights are switched on. Main beam illuminates the road farther ahead but can dazzle other road users, so it should be changed to dipped headlights when necessary.

Main-beam headlight symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

418. What does this vehicle-control symbol indicate?

Window lock.
✓ Electric window control.
Child safety lock.
Mirror adjustment.

This control operates the vehicle's electric windows. Pressing or pulling the switch lowers or raises the corresponding window.

Switch for operating an electric window
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which control is normally used to switch on the dipped headlights?

419. Which control is normally used to switch on the dipped headlights?

The windscreen-wiper control.
The hazard warning switch.
The rear-window demister.
✓ The lighting control.

The lighting control is normally used to switch on the dipped headlights. Depending on the vehicle, it may be a rotary switch or part of a lighting stalk.

Lighting control for switching on dipped headlights
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you expect after one wild animal crosses the road?

420. What should you expect after one wild animal crosses the road?

✓ More animals may follow.
The road is likely to remain clear.
You can continue normally once the animal has passed.
The animal will usually return the same way.

Many animals travel in groups. Slow down and continue watching both sides of the road.

Wild animals crossing a road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
When should you switch off your fog lights?

421. When should you switch off your fog lights?

Never, because they always improve visibility.
Whenever you stop at a traffic light.
✓ When visibility improves and they are no longer needed.
When you enter a built-up area.

Fog lights can dazzle other road users when visibility is normal, so switch them off when conditions improve.

Fog-light control as visibility improves
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if spray from other vehicles makes it hard to see?

422. What should you do if spray from other vehicles makes it hard to see?

✓ Slow down and increase following distance.
Move closer to the vehicle ahead for guidance.
Change lanes immediately to find a clearer view.
Speed up to move out of the spray more quickly.

Spray can seriously reduce visibility. Slowing down and increasing your distance gives you more time and a clearer view.

Road spray from a vehicle ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before crossing the road?

423. What should you do before crossing the road?

Listen for vehicles instead of looking.
Cross if the nearest vehicle is slowing down.
✓ Look for traffic in all directions.
Look only where traffic normally comes from.

Always check for approaching traffic from every direction before crossing.

Pedestrian checking for traffic before crossing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How can you check that a manual gearbox is in neutral?

424. How can you check that a manual gearbox is in neutral?

Press the accelerator pedal.
✓ Move the gear lever gently from side to side.
Turn the steering wheel.
Pull up the parking brake.

When a manual gearbox is in neutral, the gear lever can normally be moved freely from side to side across the centre of the gear pattern. Check that neutral is selected before starting the engine when appropriate.

Checking neutral with a manual gear lever
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you be careful when taking more than one medicine before driving?

425. Why should you be careful when taking more than one medicine before driving?

They can change the tyre pressure.
✓ Their combined effects may impair your ability to drive.
They usually make road signs harder to see.
They may make the vehicle use more fuel.

Different medicines can interact or have combined side effects such as drowsiness, dizziness, blurred vision, or slower reactions. Check the instructions and seek advice from a doctor or pharmacist if you are unsure whether it is safe to drive.

Multiple medicines and their potential effects on driving
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if traffic stops and a driver waves you across?

426. What should you do if traffic stops and a driver waves you across?

✓ Check that all lanes are safe before crossing.
Assume traffic in the other lanes will also stop.
Cross immediately once the driver waves you through.
Check only the lane nearest to you.

One driver may stop, but other vehicles may still be moving. Always check all lanes before crossing.

Driver waving a pedestrian across the road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if an EV charging connector will not release from the vehicle?

427. What should you do if an EV charging connector will not release from the vehicle?

✓ Stop the charging session, unlock the vehicle, and follow the instructions.
Pull the connector out as hard as possible.
Drive forwards slowly until the connector releases.
Twist the connector from side to side until it comes loose.

Charging connectors may remain locked while charging or until the vehicle is unlocked. Stop the charging session and follow the vehicle or charger's release procedure. Never force the connector; if it remains stuck, seek appropriate assistance.

Charging connector attached to an electric vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when entering a roundabout?

428. What should you do when entering a roundabout?

Enter if another driver appears to be slowing down.
Give way only to traffic in the lane nearest to you.
Enter if there is space, even if other traffic must slow down.
✓ Slow down, give way when required, and enter only when safe.

When approaching a roundabout, reduce your speed, observe traffic, follow the signs and local priority rules, and enter only when it is safe.

Vehicle at a roundabout entrance
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you follow the manufacturer's service schedule?

429. Why should you follow the manufacturer's service schedule?

It guarantees that no faults will develop between services.
It allows vehicle problems to be ignored until the next service.
It prevents normal wear on important vehicle components.
✓ Regular servicing can identify wear and maintain safety and reliability.

Scheduled servicing helps ensure that brakes, tyres, fluids, filters, steering, suspension, and other important systems are checked and maintained before faults become more serious.

Vehicle maintenance following a servicing schedule
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do at a railway crossing with warning lights flashing?

430. What should you do at a railway crossing with warning lights flashing?

Continue if you cannot see or hear a train.
Drive around the barrier if the road ahead is clear.
Follow the vehicle ahead across the tracks.
✓ Stop before the crossing and wait until it is safe to proceed.

Flashing warning lights mean a train may be approaching. Stop before the crossing and wait until the warning has ended and the crossing is clear.

Flashing warning lights at a railway crossing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What colour is a stop sign usually?

431. What colour is a stop sign usually?

Yellow.
White.
Green.
✓ Red.

Stop signs are almost always red because red is universally associated with danger and the need to stop immediately.

Red octagonal stop sign
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you not drive too close behind another vehicle?

432. Why should you not drive too close behind another vehicle?

It makes your steering less responsive.
✓ You may not have enough time to stop.
It causes the vehicle ahead to use more fuel.
It makes your headlights less effective.

Driving too close, or tailgating, reduces the time and space available to react and increases the risk of a rear-end collision. Use defensive driving and keep a safe following distance.

Vehicle tailgating the traffic ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you avoid if your vehicle starts to skid?

433. What should you avoid if your vehicle starts to skid?

✓ Sudden braking, acceleration, or sharp steering.
Look where you want the vehicle to go.
Stay calm and maintain control.
Use smooth steering movements.

Sudden braking, acceleration, or steering can make a skid worse. Stay calm and use smooth controls while the tyres regain grip.

Vehicle beginning to skid
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if you see fallen rocks on a mountain road?

434. What should you do if you see fallen rocks on a mountain road?

✓ Slow down and avoid them smoothly when safe.
Swerve around them immediately without checking traffic.
Maintain speed and drive over smaller stones.
Move toward the centre of the road without slowing down.

Loose rocks can damage tyres, affect steering, or block part of the road. Reduce speed and avoid sudden movements. If rocks are actively falling, do not enter or stop in the danger area. Keep a safe distance and, if necessary, wait in a safe place until it is safe to continue.

Fallen rocks on a mountain road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

435. What does this dashboard symbol indicate?

Power-steering fault.
ABS fault.
Low tyre pressure.
✓ Parking brake applied.

This symbol indicates that the parking brake is applied. It should normally go out when the parking brake is fully released.

Parking-brake indicator symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if you see smoke or fire inside a tunnel?

436. What should you do if you see smoke or fire inside a tunnel?

Keep driving normally unless the tunnel is completely blocked.
Reverse toward the entrance without checking behind.
✓ Follow tunnel instructions and leave the tunnel if it is safe to do so.
Stop near the fire so you can assess the situation.

If it is safe to drive out of the tunnel, do so. If you cannot continue safely, stop, switch off the engine, leave the vehicle, and use the marked emergency exits or refuge routes. Follow tunnel-control instructions.

Smoke inside a road tunnel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you leave space beside large vehicles when they turn?

437. Why should you leave space beside large vehicles when they turn?

✓ They may need extra room to complete the turn.
They always turn more slowly than cars.
They can turn only from the centre of the road.
They must stop before making every turn.

Large vehicles often swing wide when turning and have larger blind spots. Keep clear and do not move into the space beside them.

Large vehicle needing extra space to turn
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if you notice an unfamiliar fluid underneath your vehicle?

438. What should you do if you notice an unfamiliar fluid underneath your vehicle?

Assume a small leak is harmless condensation.
Top up the fluid levels and continue driving.
Wait until the vehicle develops another problem.
✓ Do not ignore it. Identify the fluid and arrange an inspection if necessary.

Clear water from air conditioning can be normal, but oil, coolant, fuel, transmission fluid, or brake fluid may indicate a fault requiring urgent attention.

Fluid leaking underneath a parked vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should cyclists do near a large vehicle that may be turning?

439. What should cyclists do near a large vehicle that may be turning?

Pass quickly before the vehicle starts turning.
Assume the driver will wait for you before turning.
Move alongside it if there appears to be enough space.
✓ Stay back and do not pass on the turning side.

Large vehicles need extra space to turn and may move across a cyclist's path. Remaining behind is usually safer.

Cyclist near a turning large vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does it mean to cover the brake pedal?

440. What does it mean to cover the brake pedal?

Press the brake and accelerator together.
✓ Position your right foot over the brake, ready to press it.
Apply the parking brake slightly.
Rest your foot lightly on the brake while driving.

To cover the brake, move your right foot over the brake pedal without pressing it, so you are ready to brake quickly if a hazard develops.

Right foot positioned over the brake pedal
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you reduce speed in fog?

441. Why should you reduce speed in fog?

✓ Because you have less time to react to hazards you cannot see.
To reduce vehicle emissions.
To prevent moisture from entering the engine.
To reduce fuel consumption.

Fog can hide obstacles, pedestrians, and other vehicles. Lower speed gives you more time to react.

Fog limiting a driver's view ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Who normally has priority when you enter a motorway from an entry lane?

442. Who normally has priority when you enter a motorway from an entry lane?

The vehicle travelling at the higher speed.
The vehicle closest to the end of the entry lane.
Whichever vehicle reaches the merge point first.
✓ Traffic already travelling on the motorway.

You must adjust your speed and find a safe gap without forcing motorway traffic to brake or change direction.

Vehicle entering beside traffic already on a motorway
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

443. What does this dashboard symbol indicate?

✓ A door is open.
The seat belt is not fastened.
The parking brake is applied.
The anti-theft system is active.

This symbol indicates that one or more vehicle doors are not fully closed. Check that all doors are securely shut before driving.

Door-open warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should pets be carried safely in a vehicle?

444. How should pets be carried safely in a vehicle?

On the driver's lap if they remain calm.
Free to move around during short journeys.
✓ Securely restrained so they cannot distract the driver or move dangerously.
Loose on the front passenger seat.

A pet moving freely inside a vehicle can distract the driver and may be thrown around during sudden braking or a collision. Use a suitable carrier, harness, barrier, or other secure restraint appropriate for the animal and vehicle.

Pet travelling inside a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if the vehicle consistently pulls to one side?

445. What should you do if the vehicle consistently pulls to one side?

Keep driving and correct the steering as needed.
✓ Check the tyre pressures and have the steering, alignment, and brakes inspected.
Ignore it if the tyres appear normal.
Reduce pressure in the tyre on the opposite side.

Persistent pulling can be caused by incorrect tyre pressure, wheel misalignment, suspension wear, or a braking fault. It should not be ignored.

Vehicle pulling to one side while travelling
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should cyclists do when an emergency vehicle with lights and siren approaches?

446. What should cyclists do when an emergency vehicle with lights and siren approaches?

✓ Stay alert and move to a safe position without obstructing it.
Move aside quickly without checking around you.
Follow closely behind it once it passes.
Stop immediately, even if you are in the traffic lane.

Emergency vehicles need a clear route. Move predictably and stop only where doing so is safe.

Cyclist near an approaching emergency vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if strong winds push your vehicle sideways?

447. What should you do if strong winds push your vehicle sideways?

Turn sharply against the direction of the wind.
✓ Keep calm and steer smoothly to maintain your lane.
Accelerate to make the vehicle more stable.
Brake hard immediately to stop the vehicle moving sideways.

Strong winds can push your vehicle off course, especially at higher speeds. Reduce speed and use smooth steering to stay in control.

Crosswind affecting a vehicle's road position
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do with the clutch when bringing a manual vehicle to a stop?

448. What should you do with the clutch when bringing a manual vehicle to a stop?

✓ Press it before the engine begins to stall.
Press it before using the brake pedal.
Keep it released until after the vehicle stops.
Pump it repeatedly while braking.

When stopping a manual vehicle, brake normally and press the clutch pedal before the engine speed becomes too low and the engine stalls. Avoid pressing the clutch unnecessarily early, as this reduces engine braking.

Clutch-pedal operation when stopping a manual vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the minimum age for a standard car driving licence in Thailand?

449. What is the minimum age for a standard car driving licence in Thailand?

17 years.
19 years.
✓ 18 years.
16 years.

The minimum age for a standard car driving licence in Thailand is 18 years.

Minimum age for obtaining a car driving licence
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if the accelerator becomes stuck while you are driving?

450. What should you do if the accelerator becomes stuck while you are driving?

Press the accelerator harder to try to free it.
Apply the parking brake sharply while moving.
Switch off the engine immediately before selecting neutral.
✓ Select neutral, brake firmly, and steer to a safe stopping place.

Selecting neutral disconnects engine power from the wheels. Brake firmly, maintain steering control, and switch off the engine after stopping safely.

Stuck accelerator pedal in a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA