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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
Why are roads especially slippery during rain after a dry period?

301. Why are roads especially slippery during rain after a dry period?

The first rain makes the road surface softer.
Tyres need time to adjust to a wet road.
Rain temporarily reduces the weight of the vehicle.
✓ Oil, dust, and dirt mix with water on the road surface.

After a dry period, oil and dirt can build up on the road. The first rain mixes with them and can make the surface very slippery.

Rain falling on a road after dry weather
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you adjust your speed in bad weather?

302. Why should you adjust your speed in bad weather?

To keep the engine from overheating.
To make the windscreen wipers work better.
To prevent the tyres from losing air pressure.
✓ Because visibility and grip may be reduced.

Rain, snow, fog, and ice can reduce visibility and tyre grip. Lower speed gives you more time and distance to react and stop safely.

Vehicle travelling in poor weather
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you press the clutch pedal fully when changing gear?

303. Why should you press the clutch pedal fully when changing gear?

To increase engine speed.
To lock the gear lever in position.
✓ To disengage the engine fully from the transmission.
To apply the brakes.

Pressing the clutch pedal fully disengages the engine from the transmission, allowing the gear to be changed smoothly and reducing unnecessary wear on the gearbox and clutch.

Clutch pedal pressed fully for a gear change
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

304. What does this vehicle-control symbol indicate?

Interior lighting.
Front fog lights.
Automatic headlights.
✓ Instrument-panel brightness.

This control adjusts the brightness of the instrument panel and dashboard illumination, allowing the driver to reduce or increase the lighting level.

Control for adjusting instrument-panel brightness
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which side do people drive on in Thailand?

305. Which side do people drive on in Thailand?

✓ Left-hand side.
Right-hand side.

Traffic drives on the left-hand side of the road in Thailand.

Road traffic and the designated driving side
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should heavy items be placed low and evenly distributed?

306. Why should heavy items be placed low and evenly distributed?

To make the steering lighter.
To increase the available luggage space.
✓ To help keep the vehicle stable.
To reduce fuel consumption.

A high or uneven load can make the vehicle unstable, especially during braking, cornering, or sudden steering.

Heavy luggage positioned low in a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if an object falls into the driver's footwell while driving?

307. What should you do if an object falls into the driver's footwell while driving?

Use your foot to push it towards the passenger side.
Brake suddenly so the object moves forwards.
✓ Keep control and stop safely before retrieving it.
Reach down and remove it while continuing to drive.

Do not reach down for an object while driving, as this takes your attention away from the road and can affect vehicle control. If something falls into the driver's footwell, keep control of the vehicle and stop somewhere safe before removing it.

Dropped object close to the driver's pedals
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you normally do with the gearbox during a longer stop in a manual vehicle?

308. What should you normally do with the gearbox during a longer stop in a manual vehicle?

✓ Select neutral and release the clutch.
Select reverse gear.
Keep the accelerator pressed.
Keep first gear selected with the clutch pressed.

During a longer stop, selecting neutral and releasing the clutch can reduce unnecessary strain on the clutch release mechanism. Keep the vehicle securely held with the brake or parking brake as appropriate.

Neutral gear selection during a longer stop
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before opening your car door near traffic?

309. What should you do before opening your car door near traffic?

Open the door slowly and expect traffic to avoid you.
Signal before opening the door without checking behind.
Check only for vehicles, not cyclists or pedestrians.
✓ Check for cyclists, pedestrians, and vehicles.

Before opening a car door, check carefully for cyclists, pedestrians, and vehicles to avoid causing a collision.

Checking for passing road users before opening a car door
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why are tyre condition and pressure especially important on a motorcycle?

310. Why are tyre condition and pressure especially important on a motorcycle?

They affect only comfort at high speed.
✓ They directly affect grip, stability, and braking.
They mainly affect the engine temperature.
They matter only when carrying a passenger.

A motorcycle relies on a relatively small area of tyre contact with the road. Correct tyre pressure, tread and condition are important for grip, steering, stability and braking. Check the tyres regularly and follow the manufacturer's recommended pressures.

Checking the condition of a motorcycle tyre
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why is a microsleep especially dangerous while driving?

311. Why is a microsleep especially dangerous while driving?

It only affects your ability to hear.
It makes the steering feel heavier.
It normally happens only when the vehicle is stopped.
✓ You can lose awareness of the road for several seconds.

A microsleep is a brief, involuntary episode of sleep that can last for a few seconds. During that time, you may lose awareness of the road and travel a considerable distance without reacting to hazards.

Driver losing alertness at the wheel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which foot normally operates the brake and accelerator in a manual vehicle?

312. Which foot normally operates the brake and accelerator in a manual vehicle?

The left foot for the brake and right foot for the accelerator.
✓ The right foot.
The left foot.
Either foot.

In a manual vehicle, the right foot normally operates both the brake and accelerator pedals, while the left foot operates the clutch.

Pedal arrangement and foot controls in a manual vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should loose clothing be avoided when riding a motorcycle?

313. Why should loose clothing be avoided when riding a motorcycle?

✓ It can become caught in moving parts or distract the rider.
It can make the brakes overheat.
It can prevent the engine from cooling properly.
It can make the motorcycle use more fuel.

Loose clothing, straps or scarves can flap in the wind or become caught in moving parts such as the chain or wheel. Motorcycle clothing should fit securely and should not have loose items that could interfere with safe riding.

Motorcyclist wearing loose clothing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why is it important to use bicycle lights at night?

314. Why is it important to use bicycle lights at night?

They give cyclists priority over other traffic.
They make reflective clothing unnecessary.
✓ They help you see and help others notice you.
They make the bicycle easier to control.

Front and rear lights improve visibility and make it easier for drivers, cyclists, and pedestrians to detect you.

Bicycle lights used when riding at night
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

315. What does this dashboard symbol indicate?

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

This symbol indicates a problem with the diesel particulate filter (DPF), often because soot has accumulated in the filter. The vehicle may require regeneration or professional inspection, depending on the vehicle and warning status.

Diesel particulate filter warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before overtaking while towing a trailer?

316. What should you do before overtaking while towing a trailer?

✓ Allow extra time and distance for the manoeuvre.
Accelerate sharply once you move into the other lane.
Assume the trailer will follow the same path as the vehicle.
Begin overtaking as soon as the road looks clear.

A towing vehicle accelerates more slowly, and the trailer makes the whole vehicle combination longer. Remember to allow a much larger safe gap before overtaking and enough space to return safely to your lane.

Vehicle preparing to overtake while towing a trailer
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

317. What does this dashboard symbol indicate?

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

This symbol indicates that the sidelights, also known as position or parking lights, are switched on. They help make the vehicle visible to other road users but provide little illumination of the road ahead.

Sidelight indicator symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

318. What does this dashboard symbol indicate?

Lane-departure warning.
Adaptive cruise control.
✓ Forward-collision warning.
Electronic stability control.

This symbol relates to the forward-collision warning or automatic emergency braking system. It may warn the driver when the vehicle detects a risk of collision with traffic ahead.

Forward-collision warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you leave a safe following distance inside a tunnel?

319. Why should you leave a safe following distance inside a tunnel?

Because tunnels usually have a poor road surface.
To make it easier for other vehicles to overtake.
✓ You need enough space to react if traffic slows or stops.
Because vehicles ahead cannot see you in their mirrors.

Limited space and visibility can make incidents inside tunnels especially dangerous. A safe gap gives you more time to react.

Gap between vehicles travelling through a tunnel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Should rear-seat passengers be securely restrained?

320. Should rear-seat passengers be securely restrained?

Yes, but only children need restraints in the rear.
✓ Yes, using seat belts or suitable child restraints as appropriate.
Only if the vehicle does not have rear airbags.
No, only front-seat occupants need to be restrained.

Rear-seat passengers should be securely restrained using seat belts or suitable child restraints as appropriate. Proper restraint reduces the risk of serious injury and prevents occupants from being thrown around or forwards in a collision.

Rear-seat passengers secured for a journey
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You may park anywhere as long as you leave your hazard lights on.

321. You may park anywhere as long as you leave your hazard lights on.

True.
✓ False.

Hazard lights are used to warn other road users of a hazard or an unexpectedly stopped vehicle. They do not make illegal or unsafe parking acceptable.

Parked vehicle with hazard warning lights flashing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should the head restraint be adjusted correctly?

322. Why should the head restraint be adjusted correctly?

To support the lower back.
To make the seat belt tighter.
To improve rear visibility.
✓ To reduce the risk of neck injury in a collision.

A correctly adjusted head restraint helps support the head and can reduce the risk of neck injury, especially in a rear-end collision. The top of the restraint should normally be level with the top of the head.

Adjusting a vehicle seat's head restraint
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when a traffic light turns red?

323. What should you do when a traffic light turns red?

Stop only if other traffic is approaching.
Cross the stop line before stopping.
✓ Stop and wait until you may proceed.
Continue if the junction appears clear.

A red traffic light means you must stop before the stop line, pedestrian crossing, or intersection unless a sign or signal indicates otherwise.

Red traffic light at a junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when driving in strong wind?

324. What should you do when driving in strong wind?

Increase speed so the vehicle is less affected by gusts.
✓ Hold the steering wheel firmly and reduce speed if needed.
Open the windows to improve aerodynamics.
Drive close behind large vehicles for protection from the wind.

Strong wind can affect vehicle control, especially near open areas, bridges, large vehicles, cyclists, and motorcyclists.

Driver controlling a vehicle in strong wind
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if a pedestrian is crossing slowly?

325. What should you do if a pedestrian is crossing slowly?

Sound your horn to encourage them to cross faster.
✓ Wait patiently and let them finish crossing.
Pass as soon as they have cleared your part of the road.
Drive around them if there is enough room.

Some pedestrians may need more time to cross. Stay patient, keep a safe distance, and do not pressure them.

Pedestrian crossing the road slowly
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do with a helmet that has taken a significant impact in a collision?

326. What should you do with a helmet that has taken a significant impact in a collision?

Keep using it if there are no visible cracks.
Replace only the outer shell if it is scratched.
✓ Stop using it and follow the manufacturer's replacement guidance.
Keep using it if the visor or straps still work.

A helmet can be damaged internally by a significant impact even when no damage is visible from the outside. Stop using the helmet and follow the manufacturer's guidance, which will commonly require replacement after a significant impact.

Helmet inspection after a significant impact
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when driving near a school area?

327. What should you do when driving near a school area?

Watch only for children already on the road.
Use your horn so children stay away from traffic.
Drive close behind other vehicles to keep traffic moving.
✓ Slow down and watch carefully for children.

Children near schools may cross unexpectedly or be hidden between parked vehicles. Reduce speed and be ready to stop.

Vehicle travelling near a school
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you normally do before starting an automatic vehicle?

328. What should you normally do before starting an automatic vehicle?

Select D and press the accelerator.
Select R and release the parking brake.
Leave the selector between two positions.
✓ Select P or N and press the brake pedal.

Before starting an automatic vehicle, make sure P (Park) or N (Neutral) is selected and press the brake pedal. Many automatic vehicles will only allow the engine to start when these conditions are met.

Gear selector and brake before starting an automatic vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why must a roof load be securely attached?

329. Why must a roof load be securely attached?

Because light roof loads cannot be affected by the wind.
To keep the vehicle within its normal height.
✓ It could shift or fall and create a serious hazard.
To stop the roof rack from increasing fuel consumption.

A roof load is exposed to strong airflow and movement. It must be restrained correctly and kept within the permitted limits.

Load secured to a vehicle's roof
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which control is normally used to switch between dipped and main beam headlights?

330. Which control is normally used to switch between dipped and main beam headlights?

The hazard warning switch.
The dashboard brightness control.
The windscreen-wiper stalk.
✓ The lighting stalk.

The lighting stalk is normally used to switch between dipped and main beam headlights. The exact movement varies between vehicles, so check the vehicle controls before driving.

Lighting stalk for switching between dipped and main beam
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the clutch biting point?

331. What is the clutch biting point?

✓ The point where the clutch begins to transmit power to the wheels.
The point where the engine switches off.
The point where the clutch pedal is fully pressed.
The point where the parking brake releases.

The clutch biting point is reached as the clutch pedal is released and the clutch begins to transmit power from the engine to the transmission. Controlling this point helps the driver move off smoothly.

Clutch-pedal control when moving off
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

332. What does this vehicle-control symbol indicate?

Central door locking.
Fuel-filler flap release.
✓ Boot or tailgate release.
Bonnet release.

This symbol indicates the boot or tailgate release. Operating the control unlocks or opens the luggage compartment, depending on the vehicle.

Boot or tailgate release control
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control button operate?

333. What does this vehicle-control button operate?

✓ The engine or drive system.
The automatic start-stop system.
The parking brake.
The hazard warning lights.

The engine start/stop button is used to start or switch off the vehicle's engine or electric drive system. Starting the vehicle normally also requires the brake or clutch pedal to be pressed.

Engine start/stop button in a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before making a turn?

334. What should you do before making a turn?

Signal only after you begin turning.
Check only the traffic directly ahead.
Rely on other road users to slow down for you.
✓ Check mirrors, signal, and make sure it is safe.

Before turning, check your mirrors, use your indicator, and make sure the turn can be made safely.

Driver preparing to turn at a junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you be especially alert for wild animals at dawn and dusk?

335. Why should you be especially alert for wild animals at dawn and dusk?

Speed limits change automatically at dawn and dusk.
Animals cannot see vehicles during daylight.
✓ Many animals are more active at these times.
Wild animals avoid roads during the rest of the day.

Many wild animals are most active around dawn and dusk, when visibility may also be reduced.

Wild animal beside a road in low light
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which speed unit is used in Thailand?

336. Which speed unit is used in Thailand?

✓ Kilometres per hour (km/h).
Miles per hour (mph).

Road speeds in Thailand are shown in kilometres per hour (km/h).

Road speed expressed in kilometres per hour
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you be cautious when following a vehicle carrying a loose load?

337. Why should you be cautious when following a vehicle carrying a loose load?

Loose loads give the vehicle priority when changing lanes.
The vehicle must stop whenever the load shifts.
Loose loads prevent the driver from using the mirrors.
✓ Objects may fall onto the road.

A poorly secured load can fall or shift suddenly. Keep extra distance and avoid following too closely.

Vehicle carrying an unsecured load ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you leave a much larger following distance on an icy road?

338. Why should you leave a much larger following distance on an icy road?

✓ Because stopping distances can be much longer.
To prevent ice from forming on the windscreen.
To give the engine more time to warm up.
To make the headlights work more effectively.

Tyres have much less grip on ice, so braking takes longer. Extra distance gives you more time to slow down safely.

Following distance between vehicles on an icy road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid placing objects on or over an airbag cover?

339. Why should you avoid placing objects on or over an airbag cover?

✓ They could interfere with deployment and become dangerous projectiles.
They could make the airbag deploy too slowly.
They could make the dashboard harder to clean.
They could prevent the seat belt from locking.

Do not place or attach objects over an airbag cover or in an airbag's deployment area. They may interfere with the airbag as it inflates and could be thrown towards occupants when the airbag deploys.

Objects placed over a vehicle's airbag cover
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you normally apply the brake pedal for a smooth stop?

340. How should you normally apply the brake pedal for a smooth stop?

Pump the pedal repeatedly.
Use the parking brake instead.
✓ Apply pressure progressively.
Press it as hard as possible immediately.

For normal braking, apply the brake pedal progressively and smoothly. As the vehicle comes to a stop, easing the pressure slightly can help avoid a sudden jerk.

Progressive brake-pedal pressure for a smooth stop
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you keep a dog on a leash near traffic?

341. Why should you keep a dog on a leash near traffic?

✓ To prevent it from suddenly running into the road.
To make it easier for drivers to hear the dog.
To make approaching vehicles drive more slowly.
To give the dog priority when crossing the road.

Dogs can react unpredictably to vehicles, people, noises, or other animals. Keeping a dog under close control on a leash near traffic reduces the risk of it suddenly entering the road and endangering itself or other road users.

Pedestrian keeping a dog on a leash near traffic
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if passengers are distracting you while driving?

342. What should you do if passengers are distracting you while driving?

✓ Ask them to stop and keep your attention on the road.
Turn around briefly so you can speak to them.
Ignore the traffic until the distraction has passed.
Drive faster so you can finish the journey sooner.

Passengers can reduce a driver's attention and concentration. If their behaviour becomes distracting, ask them to stop and keep your focus on driving. If necessary, stop somewhere safe before dealing with the situation.

Passengers distracting a driver
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You should keep both hands ready to control the steering.

343. You should keep both hands ready to control the steering.

False.
✓ True.

Keeping proper control of the steering wheel helps you react safely to changes in traffic and road conditions.

Driver keeping both hands on the steering wheel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How does higher speed affect a vehicle's stopping distance?

344. How does higher speed affect a vehicle's stopping distance?

It affects reaction distance but not braking distance.
It affects braking distance only on wet roads.
It has no effect if the brakes are in good condition.
✓ It increases the distance needed to stop.

As speed increases, the vehicle travels farther while the driver reacts and requires more distance to brake. This means the total stopping distance increases significantly as speed rises.

Vehicle speed and the distance needed to stop
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when driving near animals?

345. What should you do when driving near animals?

Maintain speed if they remain beside the road.
Move closer so you can pass before they react.
Flash your headlights repeatedly to warn them.
✓ Slow down and be ready to stop.

Animals can move unpredictably. Slow down, stay alert, and be prepared to stop safely.

Animals near moving road traffic
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should the interior rear-view mirror be adjusted?

346. How should the interior rear-view mirror be adjusted?

To show mainly the rear seats.
To point towards the left door mirror.
✓ To give a clear view through the rear window.
To show the driver's face.

Adjust the interior rear-view mirror before driving so that you have a clear view through the rear window without needing to move your head significantly.

Adjusting the interior rear-view mirror
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why are reversing and making a U-turn on a motorway extremely dangerous?

347. Why are reversing and making a U-turn on a motorway extremely dangerous?

The speedometer may become less accurate.
The steering may become heavier while turning around.
Motorway cameras may not recognise the vehicle correctly.
✓ Other drivers approach quickly and do not expect traffic facing them.

Motorway traffic travels at high speed. Unexpected reversing or turning can cause a severe collision.

Vehicle on a motorway hard shoulder
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid overloading a trailer?

348. Why should you avoid overloading a trailer?

It makes the trailer easier to control.
✓ It can reduce stability and place excessive strain on the vehicle.
It keeps the trailer more stable in strong winds.
It reduces tyre wear on the towing vehicle.

Overloading can affect braking, steering, tyres, suspension, and trailer stability. Always remain within permitted limits. After loading, check that the load is secure and correctly distributed before starting your journey.

Loaded trailer and towing limits
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

349. What does this dashboard symbol indicate?

Low tyre pressure.
Electronic stability control.
✓ Power-steering warning.
Brake-system warning.

This symbol indicates a possible fault with the power-steering system. Steering assistance may be reduced or unavailable, making the steering wheel harder to turn.

Power-steering warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Where should passengers get in or out of a vehicle when possible?

350. Where should passengers get in or out of a vehicle when possible?

✓ On the side away from moving traffic.
On the side closest to approaching traffic.
Through whichever door opens first.
From the driver's side in every situation.

Passengers should get in or out on the side away from moving traffic whenever possible. This is particularly important for children, who may not recognise approaching traffic or other road users. Before opening any door, check that it is safe.

Passenger leaving a vehicle on the side away from traffic
AI-generated by Traffic-rules.com • WCIT • CC BY-SA