Support us

QuizTraffic rulesThailand

This interesting quiz helps you test your knowledge in a clear and visual way. With easy multiple-choice questions, you can quickly build confidence and learn new facts while keeping it simple, interactive, and fun.

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 when approaching a tunnel?

501. What should you do when approaching a tunnel?

Switch on the hazard lights before entering.
✓ Use the correct lights and keep a safe distance.
Drive closer to the vehicle ahead for guidance.
Increase speed to spend less time inside.

When entering a tunnel, use the correct lights, keep enough distance, and stay alert for slower traffic.

Vehicle approaching a road tunnel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which selector position is used for normal forward driving?

502. Which selector position is used for normal forward driving?

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

Select D (Drive) for normal forward driving in a vehicle with an automatic transmission. The transmission then selects the appropriate gear automatically.

Automatic gear selector with P, R, N and D positions
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does the resume function of cruise control normally do?

503. What does the resume function of cruise control normally do?

Sets the vehicle's current speed as a new limit.
Applies the brakes automatically.
✓ Returns the vehicle to the previously set cruising speed.
Switches cruise control off completely.

The resume function normally returns the vehicle to the previously set cruise-control speed after the system has been temporarily disengaged. The driver should use it only when traffic and road conditions are suitable.

RES button for resuming the stored cruising speed
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do with the parking brake before leaving a parked vehicle?

504. What should you do with the parking brake before leaving a parked vehicle?

Leave it partly applied.
Release it completely.
Apply it only on a slope.
✓ Apply it securely.

Before leaving a parked vehicle, apply the parking brake securely to help prevent unintended movement. Also select the appropriate gear or transmission position for parking.

Securing a parked vehicle with the parking brake
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should unnecessary engine idling be avoided?

505. Why should unnecessary engine idling be avoided?

It makes the tyres lose pressure.
It immediately damages the brakes.
✓ It uses fuel without moving the vehicle.
It always causes the engine to overheat.

An idling combustion engine uses fuel while the vehicle is stationary. Avoid unnecessary idling where it is safe and appropriate to switch the engine off, taking account of the vehicle manufacturer's instructions and local rules.

Stationary vehicle with its engine idling
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do at a railway crossing when the barriers are closing?

506. What should you do at a railway crossing when the barriers are closing?

Cross quickly if you cannot see a train.
Continue if the barriers are not fully closed.
✓ Stop and wait until the barriers are completely open.
Follow the vehicle ahead across the tracks.

Never enter a railway crossing when barriers are closing or warning signals are active. Stop and wait until it is safe.

Barriers closing at a railway crossing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid travelling with the seatback excessively reclined?

507. Why should you avoid travelling with the seatback excessively reclined?

It can cause the seat belt to lock during normal driving.
It can cause the seat to slide forwards when braking.
✓ It can reduce how effectively the seat belt restrains you.
It can prevent the head restraint from being adjusted.

An excessively reclined seat can affect how the seat belt fits and restrains your body and may increase the risk of sliding under the lap belt in a collision. Sit in a reasonably upright position so the lap belt stays low across the hips and the shoulder belt lies correctly across the chest.

Vehicle seat with an excessively reclined backrest
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you approach a sharp bend on a mountain road?

508. How should you approach a sharp bend on a mountain road?

Move toward the centre of the road for a better view.
✓ Reduce speed before the bend and remain in your lane.
Brake hard while turning through the bend.
Accelerate through the bend to maintain momentum.

Mountain bends may hide oncoming vehicles, cyclists, animals, or debris. Slow down before entering and keep a safe road position.

Sharp bend on a mountain road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which pedal is used to slow down or stop the vehicle?

509. Which pedal is used to slow down or stop the vehicle?

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

The brake pedal is used to reduce the vehicle's speed or bring it to a stop. In a manual vehicle, it is the middle pedal.

Brake pedal in the driver's footwell
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if another driver does not give way when they should?

510. What should you do if another driver does not give way when they should?

Maintain your speed because you have priority.
Move closer so the other driver is forced to give way.
✓ Slow down and avoid a collision.
Accelerate so you pass through first.

Even if you have priority, safety comes first. Slow down, stay calm, and avoid creating a dangerous situation.

Conflicting vehicle movements at a junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when reversing with a trailer?

511. What should you do when reversing with a trailer?

✓ Reverse slowly and make small steering corrections.
Reverse quickly to keep the trailer straight.
Ask a guide to stand directly behind the trailer.
Make large steering corrections as soon as it turns.

Trailers react quickly to steering while reversing. Move slowly, observe carefully, and use a guide only from a safe visible position.

Vehicle reversing with a trailer
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
When should you select reverse gear in a manual vehicle?

512. When should you select reverse gear in a manual vehicle?

Before pressing the clutch pedal.
Whenever you want to reduce speed.
While the vehicle is still moving forward slowly.
✓ After the vehicle has come to a complete stop.

Select reverse gear only after the vehicle has come to a complete stop. Press the clutch fully before selecting reverse to avoid unnecessary wear or damage to the transmission.

Selecting reverse gear in a stationary manual vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should cyclists do after a collision or hard fall?

513. What should cyclists do after a collision or hard fall?

✓ Check yourself and inspect the bicycle before riding again.
Continue if you feel fine and the bicycle looks normal.
Check only the parts that were directly involved in the fall.
Check only the bicycle and ignore minor injuries.

A fall can damage the brakes, wheels, frame, handlebars, or helmet. Injuries may also not be immediately obvious.

Checking a bicycle after a fall or collision
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if traffic ahead is blocking a junction?

514. What should you do if traffic ahead is blocking a junction?

Follow the vehicle ahead into the junction.
✓ Wait until there is enough space to clear the junction.
Enter the junction and wait for traffic to move.
Use the horn so traffic ahead moves forward.

Do not enter a junction if traffic ahead prevents you from clearing it safely. Waiting before the junction helps avoid blocking crossing traffic, pedestrians, cyclists, or other road users.

Queue of traffic blocking a junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the purpose of a pedestrian crossing?

515. What is the purpose of a pedestrian crossing?

✓ To help pedestrians cross the road safely.
To allow pedestrians to cross without checking traffic.
To give pedestrians priority throughout the whole street.
To separate pedestrians from cyclists along the road.

Pedestrian crossings provide a designated place where people can safely cross the road.

Pedestrian crossing across a road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when livestock are on the road?

516. What should you do when livestock are on the road?

✓ Slow down and follow the instructions of the person controlling them.
Drive through the group before it spreads across the road.
Sound the horn so the animals move aside.
Use the verge to pass the animals.

Livestock may spread across the road, stop suddenly, or change direction without warning. Slow down, keep a safe distance, avoid sudden movements or loud noises, and follow any instructions from the person controlling the animals.

Livestock being moved along a road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should tyre pressure normally be checked?

517. How should tyre pressure normally be checked?

✓ When the tyres are cold, using the manufacturer's recommended pressure.
Using the maximum pressure shown on the tyre.
Only by a certified maintenance service.
Immediately after a long or high-speed journey.

Tyre pressure rises as tyres become warm. Check them when cold and use the pressure specified on the vehicle label or in the owner's manual.

Checking a vehicle's tyre pressure
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should a motorcycle helmet be worn correctly and securely fastened?

518. Why should a motorcycle helmet be worn correctly and securely fastened?

To improve the rider's hearing in traffic.
To prevent the motorcycle from skidding.
✓ To reduce the risk of serious head injury in a collision.
To make the motorcycle easier to balance.

A correctly fitted and securely fastened motorcycle helmet helps protect the rider's head and can reduce the risk and severity of head injury in a collision or fall.

Motorcyclist wearing a securely fastened helmet
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before leaving a motorway?

519. What should you do before leaving a motorway?

Wait until the exit begins before checking your mirrors.
✓ Check your mirrors, signal in good time, and enter the exit lane safely.
Signal only after entering the exit lane.
Brake sharply before entering the exit lane.

Plan your exit early, move into the correct lane safely, and reduce speed after entering the exit road where appropriate.

Vehicle preparing to take a motorway exit
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if a gear does not engage easily in a manual vehicle?

520. What should you do if a gear does not engage easily in a manual vehicle?

Press the accelerator fully.
Push the lever harder until the gear engages.
✓ Avoid forcing the gear lever.
Release the clutch suddenly.

If a gear does not engage easily, do not force the gear lever. Make sure the clutch is fully pressed and the vehicle's speed is suitable for the gear before trying again.

Operating a manual gear lever without forcing it
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if your vehicle catches fire?

521. What should you do if your vehicle catches fire?

✓ Stop, switch off the engine, evacuate everyone, and call the emergency services.
Keep driving slowly until you find a safer place to stop.
Open the bonnet fully to find where the fire started.
Stay inside the vehicle while waiting for assistance.

Move everyone well away from the vehicle and call emergency services. If the fire is small and it is safe to do so, use a suitable fire extinguisher. Opening the bonnet fully can supply additional oxygen and cause the fire to intensify.

Vehicle with a fire breaking out
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do after fitting a temporary spare wheel?

522. What should you do after fitting a temporary spare wheel?

Use it as a permanent replacement if it looks undamaged.
Ignore its speed restriction on short journeys.
✓ Follow its speed and distance restrictions and replace it as soon as possible.
Drive normally if the vehicle feels stable.

Temporary spare wheels may have limited speed, distance, and handling capabilities. Arrange a proper repair or replacement promptly.

Temporary spare wheel fitted to a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before rejoining traffic after a breakdown?

523. What should you do before rejoining traffic after a breakdown?

✓ Check all around, signal, and enter only when there is a safe gap.
Enter the lane slowly so other traffic has time to react.
Pull out as soon as there is enough space for your vehicle.
Signal and expect approaching traffic to slow down.

Check mirrors and blind spots, signal clearly, and build up speed safely without causing approaching traffic to brake suddenly.

Vehicle preparing to rejoin traffic after a breakdown
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Should the side stand be fully raised before riding a motorcycle?

524. Should the side stand be fully raised before riding a motorcycle?

No, it only needs to be raised on motorways.
Yes, but only when carrying a passenger.
✓ Yes, a lowered stand could catch the road and affect control.
No, it can remain down when riding slowly.

The side stand should be fully raised before riding. If it remains down, it may strike the road surface, particularly when turning, and could cause the rider to lose control.

Motorcycle side stand and pre-ride checks
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when a road worker directs traffic?

525. What should you do when a road worker directs traffic?

✓ Follow the worker's signals and instructions.
Wait for a police officer to confirm the signal.
Follow the vehicle ahead instead of the worker's signal.
Follow the normal traffic signs instead.

Authorised road workers may control traffic through a work zone. Watch carefully and follow their directions.

Road worker directing traffic
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

526. What does this dashboard symbol indicate?

✓ Parking assistance.
Electronic stability control.
Adaptive cruise control.
Lane-departure warning.

This symbol relates to the vehicle's parking assistance system. Depending on the vehicle, the system may use sensors or cameras to detect obstacles and assist the driver while parking.

Parking-assistance symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why can bridges be dangerous in strong winds?

527. Why can bridges be dangerous in strong winds?

Vehicles automatically accelerate on bridges.
Steering works less effectively above water.
Bridge lighting makes it harder to judge speed.
✓ They are often exposed to stronger gusts.

Bridges are often open and exposed, allowing strong winds to affect vehicles more suddenly.

Exposed bridge in strong wind
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you check after fitting a wheel?

528. What should you check after fitting a wheel?

That the tyre is touching the wheel arch.
That the wheel can move slightly on the hub.
✓ That the wheel nuts are tightened correctly.
That the jack remains partly under the vehicle.

After fitting a wheel, make sure the wheel nuts are tightened correctly using the manufacturer's specified procedure and torque. Incorrectly tightened wheel nuts can loosen or damage the wheel. Recheck them later if the vehicle or wheel manufacturer recommends it.

Checking wheel nuts after fitting a wheel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you increase your following distance on wet roads?

529. Why should you increase your following distance on wet roads?

✓ Because braking distances are longer.
Because wet roads make the speedometer less accurate.
Because tyres need more space to warm up.
Because vehicles ahead have priority in rain.

Water reduces grip between the tyres and the road, so it takes longer to slow down or stop safely.

Following distance between vehicles on a wet road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before driving after taking medicine?

530. What should you do before driving after taking medicine?

Drive normally if the medicine was prescribed.
Drink coffee to prevent any side effects.
✓ Check whether it may affect your ability to drive.
Take an extra dose before a long journey.

Some medicines can affect driving ability by causing drowsiness, dizziness, blurred vision, slower reactions, or reduced concentration. Check the label or patient information and follow advice from your doctor or pharmacist before driving.

Checking medicine warnings before driving
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why can fog make it difficult to judge the speed of other vehicles?

531. Why can fog make it difficult to judge the speed of other vehicles?

Fog causes vehicles to travel at uneven speeds.
✓ Limited visibility makes distances and movement harder to estimate.
Fog makes vehicles appear larger than they are.
Fog makes road markings appear closer together.

Fog reduces visual information, making it harder to judge how far away another vehicle is and how quickly it is approaching.

Other traffic partly obscured by fog
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

532. What does this dashboard symbol indicate?

Low coolant level.
Engine-temperature warning.
Charging-system warning.
✓ Low engine oil level.

This symbol indicates that the engine oil level is low. Check the oil level according to the manufacturer's instructions and add the correct oil if necessary.

Low oil-level warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You should stay focused on the road and avoid unnecessary distractions.

533. You should stay focused on the road and avoid unnecessary distractions.

False.
✓ True.

Distractions reduce awareness and reaction time, making driving more dangerous.

Driver keeping attention on the road ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you wear suitable footwear when driving?

534. Why should you wear suitable footwear when driving?

So the brakes respond more quickly.
So the clutch cannot wear out.
So the vehicle uses less fuel.
✓ So you can operate the pedals accurately and safely.

Suitable footwear helps you operate the accelerator, brake, and clutch accurately. Loose, bulky, or slippery footwear can interfere with pedal control or become caught around the pedals.

Driver's footwear and contact with the pedals
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if a motorcycle's drive chain is too loose?

535. What should you do if a motorcycle's drive chain is too loose?

Tighten it as much as possible.
✓ Adjust it correctly or have it checked before riding.
Increase speed to keep the chain under tension.
Keep riding if the motorcycle still moves normally.

A loose drive chain can affect power transmission, damage components, or come off the sprockets. The chain should have the correct tension and lubrication specified by the motorcycle manufacturer. A chain that is too tight can also cause damage.

Loose drive chain on a motorcycle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do after hitting a deep pothole hard?

536. What should you do after hitting a deep pothole hard?

✓ Check for tyre or wheel damage when it is safe to stop.
Increase speed to see whether the steering remains stable.
Reduce the tyre pressure to absorb further bumps.
Continue driving normally if the tyre still looks inflated.

A hard impact with a pothole can damage tyres, wheel rims, steering, suspension, or wheel alignment. When it is safe to stop, inspect the tyres and wheels and pay attention to unusual vibration, pulling, or steering changes. Have the vehicle checked if you suspect damage.

Checking a tyre and wheel after hitting a pothole
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

537. What does this vehicle-control symbol indicate?

Fuel-filler flap release.
✓ Bonnet release.
Parking brake.
Boot release.

This control releases the bonnet so that it can be opened. A secondary safety catch under the bonnet normally has to be released before it can be fully raised.

Bonnet-release control and symbol
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you check the engine oil level?

538. How should you check the engine oil level?

Add oil every time you refuel the vehicle.
Fill the engine until oil reaches the filler opening.
Use the coolant reservoir to measure the oil level.
✓ Follow the manufacturer's instructions with the vehicle on level ground.

Use the dipstick or electronic oil-level system as described in the owner's manual. The engine is usually switched off, and the vehicle should be standing on level ground.

Checking the engine oil level
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Speed limits only apply when there is heavy traffic.

539. Speed limits only apply when there is heavy traffic.

True.
✓ False.

Speed limits apply at all times unless a different limit is clearly indicated.

Speed-limit sign beside a road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if a friend who has been drinking wants to drive?

540. What should you do if a friend who has been drinking wants to drive?

✓ Encourage them not to drive and arrange safe transport.
Let them drive slowly on quiet roads.
Give them coffee and wait a short while.
Let them drive if they say they feel sober.

Preventing an impaired person from driving can protect them, their passengers, and other road users. Arrange a sober driver, taxi, public transport, or accommodation.

Friends discussing safe transport after drinking
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when construction vehicles enter or leave the road?

541. What should you do when construction vehicles enter or leave the road?

Drive closely behind it until there is room to pass.
Assume it will stop before entering your lane.
Use your horn so the driver waits for you.
✓ Slow down and be prepared for them to move across your path.

Construction vehicles may move slowly, have limited visibility, or carry loose material. Give them time and space to manoeuvre.

Construction vehicle entering or leaving a road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before driving if snow or ice covers your vehicle?

542. What should you do before driving if snow or ice covers your vehicle?

Clear only the areas needed for your immediate view.
Leave snow on the roof if it is firmly packed.
Let the heater clear the ice while you drive.
✓ Clear the windows, mirrors, lights, roof, and number plates.

You need a clear view in every direction. Snow or ice left on the roof can also fall or blow onto other road users.

Clearing snow and ice from a vehicle before driving
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the purpose of the manual parking brake?

543. What is the purpose of the manual parking brake?

To select reverse gear.
To disengage the clutch.
✓ To help keep the vehicle stationary when parked.
To slow the vehicle during normal driving.

The manual parking brake helps keep the vehicle stationary when parked. It is normally applied by pulling up the handbrake lever and released before driving away.

Manual handbrake lever in a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when approaching stationary or slow-moving traffic on a motorway?

544. What should you do when approaching stationary or slow-moving traffic on a motorway?

Maintain speed until you are close to the queue.
Follow the vehicle ahead closely to keep traffic moving.
✓ Reduce speed early and be prepared to stop.
Change lanes immediately to avoid slowing down.

Motorway queues can appear suddenly. Early braking gives following traffic more time to react.

Slow-moving traffic ahead on a motorway
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid remaining beside a large vehicle on a motorway?

545. Why should you avoid remaining beside a large vehicle on a motorway?

Their tyres may reduce the motorway speed limit.
✓ You may remain in its blind spot and have less room to escape.
Large vehicles always travel more slowly than cars.
Driving beside them improves your view of the road ahead.

Large vehicles have significant blind spots. Avoid travelling alongside them longer than necessary.

Vehicle alongside a large vehicle on a motorway
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should cyclists do when approaching a junction?

546. What should cyclists do when approaching a junction?

✓ Reduce speed, observe carefully, and be ready to stop.
Watch only the traffic directly ahead of you.
Maintain your speed if no traffic is visible.
Accelerate so you spend less time at the junction.

Junctions create conflict points between road users. Slowing down gives you more time to see hazards and react safely.

Cyclist approaching a road junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you normally hold the steering wheel while driving?

547. How should you normally hold the steering wheel while driving?

✓ With both hands in a balanced position.
With one hand at the top of the wheel.
With both hands together at the bottom.
With one hand resting on the gear lever.

Hold the steering wheel with both hands in a balanced position so that you can steer smoothly and react quickly. A position around nine and three o'clock generally provides good control.

Driver holding the steering wheel with both hands
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You should follow the vehicle in front as closely as possible in traffic.

548. You should follow the vehicle in front as closely as possible in traffic.

True.
✓ False.

You should keep a safe following distance so you have enough time to react if traffic slows or stops suddenly.

Vehicle following closely behind another vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before turning across a cycle lane?

549. What should you do before turning across a cycle lane?

Sound your horn and turn immediately.
Ignore the cycle lane if you are signalling.
Enter the cycle lane without checking behind.
✓ Check mirrors and blind spots carefully for cyclists.

Cyclists may be beside or behind you when you turn. Check mirrors and blind spots, signal clearly, and turn only when it is safe.

Vehicle preparing to turn across a cycle lane
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

550. What does this dashboard symbol indicate?

Air conditioning is active.
Winter tyres are fitted.
The windscreen is frozen.
✓ Risk of icy road conditions.

This symbol warns that the outside temperature is low enough for ice to form. Road surfaces, especially bridges and shaded areas, may be slippery even when they appear clear.

Icy-road warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA