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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
Why should you avoid unnecessary lane changes in roadworks?

451. Why should you avoid unnecessary lane changes in roadworks?

Drivers should always use the lane with fewer vehicles.
Temporary lanes are designed for frequent lane changes.
✓ Narrow lanes and changing layouts increase the risk of collision.
Changing lanes helps traffic move faster through roadworks.

Frequent lane changes create additional risk where space is limited and drivers are already adapting to temporary layouts.

Vehicles travelling through restricted roadworks lanes
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you leave extra space when passing cyclists in strong winds?

452. Why should you leave extra space when passing cyclists in strong winds?

✓ They may be blown sideways unexpectedly.
Strong wind makes bicycle brakes less effective.
Cyclists must stop when a vehicle passes them.
Wind increases the pressure in bicycle tyres.

Strong gusts can affect cyclists' balance and direction. Extra passing space reduces the risk of a collision.

Vehicle passing a cyclist in windy conditions
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should a motorcyclist do in strong crosswinds?

453. What should a motorcyclist do in strong crosswinds?

Accelerate to get through the windy area quickly.
✓ Reduce speed and be prepared for sudden gusts.
Follow a large vehicle closely for protection from the wind.
Ride as close to the edge of the road as possible.

Strong crosswinds can push a motorcycle sideways and sudden gusts can affect its stability. Reduce speed, keep a steady grip on the handlebars and allow extra space, especially on exposed roads, bridges, or when passing gaps and large vehicles.

Motorcyclist riding in strong crosswinds
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why must you take wider turns when towing a trailer?

454. Why must you take wider turns when towing a trailer?

✓ The trailer follows a tighter path than the towing vehicle.
Wider turns decrease tyre wear.
Wide turns prevent the trailer from swaying.
The trailer always follows the same path as the towing vehicle.

Trailer wheels cut closer to the inside of a turn. Allow enough clearance from kerbs, signs, pedestrians, and other vehicles.

Towing vehicle and trailer negotiating a turn
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you normally do when the fuel nozzle automatically clicks off?

455. What should you normally do when the fuel nozzle automatically clicks off?

✓ Stop refuelling rather than continuing to top up the tank.
Shake the vehicle to make room for more fuel.
Keep filling until fuel reaches the filler opening.
Remove the nozzle and restart the engine immediately.

When the fuel nozzle automatically clicks off, stop refuelling rather than repeatedly topping up the tank. Continuing can cause fuel to spill or overflow and may interfere with the vehicle's fuel-vapour control system.

Fuel nozzle in a vehicle's filler opening
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why is counting drinks an unreliable way to decide whether you can drive?

456. Why is counting drinks an unreliable way to decide whether you can drive?

One drink affects every person in the same way.
Food makes each drink count as less alcohol.
You can judge your alcohol level by how sober you feel.
✓ Drink strength, serving size, and individual effects can vary.

Alcohol concentration and serving sizes vary, and factors such as body size, food, medication, and time can affect impairment.

Alcoholic drinks with different strengths and serving sizes
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if your main beam could dazzle another driver?

457. What should you do if your main beam could dazzle another driver?

Keep the main beam on unless the other driver flashes you.
Reduce speed but leave the main beam on.
✓ Switch to dipped headlights.
Move farther from the centre and keep the main beam on.

Main beam can dazzle other road users and reduce their visibility. Switch to dipped headlights whenever your main beam could dazzle another driver.

Headlight glare affecting another road user
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the safest choice if you have consumed alcohol?

458. What is the safest choice if you have consumed alcohol?

Drive only if you do not feel drunk.
Drink coffee before driving.
Eat something and wait a short while.
✓ Do not drive and arrange a sober form of transport.

Alcohol can impair judgement, coordination, vision, and reaction time. A sober driver, taxi, public transport, or an overnight stay is the safer choice.

Alcohol consumption and the decision not to drive
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should a front passenger keep their feet off the dashboard?

459. Why should a front passenger keep their feet off the dashboard?

It can interfere with the rear-view mirror.
It can prevent the engine from cooling properly.
✓ It can greatly increase the risk of injury if the airbag deploys.
It can make the front seat slide forwards during braking.

A front airbag deploys very quickly and with considerable force. If a passenger has their feet or legs on the dashboard, airbag deployment can force their legs backwards and greatly increase the risk of serious injury. Passengers should sit normally with their feet in the footwell and wear their seat belts correctly. The driver should make sure everyone is seated and restrained safely before setting off.

Passenger resting their feet on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before driving through a puddle?

460. What should you do before driving through a puddle?

Follow another vehicle closely to judge the depth.
✓ Slow down and check that it is safe.
Maintain your normal speed if the road looks clear.
Accelerate so you spend less time in the water.

Large puddles can hide holes, reduce grip, or cause water to splash onto pedestrians or other vehicles. Slow down and proceed carefully.

Vehicle approaching a puddle on the road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why can main-beam headlights make driving in fog more difficult?

461. Why can main-beam headlights make driving in fog more difficult?

The brighter light makes the windscreen mist more quickly.
The stronger beam uses too much electrical power.
✓ The light can reflect off fog droplets and reduce visibility.
Main beam makes interior lights less effective.

Main beam can reflect back from fog and create glare, making it harder to see the road ahead.

Headlight glare reflected by fog
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when roadworks are ahead?

462. What should you do when roadworks are ahead?

✓ Slow down and follow the temporary signs.
Ignore temporary signs if permanent signs are still visible.
Use your horn to warn road workers that you are approaching.
Maintain normal speed if your lane remains open.

Roadworks can create narrow lanes, workers near traffic, uneven surfaces, and temporary rules. Slow down and follow the signs.

Roadworks and temporary traffic signs ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if your vehicle begins to skid on ice?

463. What should you do if your vehicle begins to skid on ice?

Press the brake pedal hard and hold it.
Apply the parking brake to straighten the vehicle.
✓ Ease off the accelerator and steer smoothly in the direction you want to travel.
Steer rapidly from side to side.

Avoid sudden braking or steering. Look where you want to go and use gentle controls while the tyres regain grip.

Vehicle skidding on an icy road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Are motorcycle riders generally required to wear a helmet in Thailand?

464. Are motorcycle riders generally required to wear a helmet in Thailand?

No.
✓ Yes.

Motorcycle riders in Thailand are generally required to wear an approved helmet.

Motorcyclist wearing a protective helmet
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What normally happens to cruise control when you press the brake pedal?

465. What normally happens to cruise control when you press the brake pedal?

The selected speed increases.
✓ Cruise control is cancelled or temporarily disengaged.
The parking brake is applied.
The accelerator pedal locks in position.

Pressing the brake pedal normally cancels or temporarily disengages cruise control, returning speed control to the driver.

Brake-pedal operation to disengage cruise control
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

466. What does this vehicle-control symbol indicate?

Central door locking.
Airbag-system fault.
✓ Passenger airbag deactivation.
Child safety lock.

This control allows the front passenger airbag to be deactivated on vehicles equipped with this function. The airbag must be deactivated when a rear-facing child restraint is used on the front passenger seat.

Front passenger airbag deactivation control
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if an EV charging cable or connector is damaged?

467. What should you do if an EV charging cable or connector is damaged?

✓ Do not use it, and report or arrange repair of the damage.
Hold the damaged section away from the vehicle.
Reduce the charging power and continue using it.
Use it if the vehicle still begins charging.

Do not use a damaged charging cable or connector. Damage can create a risk of electric shock, overheating, or fire. Use suitable undamaged charging equipment and report the fault or arrange professional repair or replacement.

Damaged electric-vehicle charging cable or connector
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if someone is injured in a road collision?

468. What should you do if someone is injured in a road collision?

Give them food or drink while waiting for help.
✓ Call for help and avoid moving them unless there is immediate danger.
Help them stand up and check whether they can walk.
Move them to a more comfortable position immediately.

Moving an injured person can worsen spinal or other injuries. Keep them calm, protect them from further danger, and provide first aid only within your level of training.

Assistance for an injured person after a road collision
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should a motorcyclist do before entering a bend?

469. What should a motorcyclist do before entering a bend?

Accelerate before checking how sharp the bend is.
✓ Reduce speed before the bend and look through it.
Look only at the road directly in front of the wheel.
Brake hard after beginning to lean.

Adjust your speed before entering the bend so you can steer smoothly and remain within a safe position. Look through the bend towards where you want to travel and be prepared for hazards that may be hidden from view.

Motorcyclist approaching a bend
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if your vehicle develops a serious fault while driving?

470. What should you do if your vehicle develops a serious fault while driving?

Accelerate to see if the fault disappears.
Switch off the engine before slowing down.
Continue driving until the vehicle stops by itself.
✓ Keep control, reduce speed, and move to a safe place if possible.

Your first priority is to keep control of the vehicle. Reduce speed smoothly and move out of the path of traffic where possible, signalling when appropriate. Avoid harsh steering or braking unless necessary.

Vehicle stopped after developing a mechanical fault
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the safest way to cross the road with a child?

471. What is the safest way to cross the road with a child?

Let them walk slightly ahead of you.
✓ Hold their hand and keep them close.
Let them run once the first lane is clear.
Cross separately so everyone has more space.

Children can be unpredictable near traffic. Keep them close and guide them safely across the road.

Adult holding a child's hand while crossing the road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How can higher speed affect fuel or energy consumption?

472. How can higher speed affect fuel or energy consumption?

It has no effect once the vehicle is moving.
It reduces aerodynamic resistance.
It improves tyre efficiency in every situation.
✓ It can increase consumption because air resistance rises.

As speed increases, aerodynamic resistance generally rises, so the vehicle needs more energy to maintain that speed. Driving smoothly at an appropriate speed can therefore reduce fuel or energy consumption.

Vehicle speed and aerodynamic resistance
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which signs may indicate that you are becoming too tired to drive safely?

473. Which signs may indicate that you are becoming too tired to drive safely?

✓ Yawning, heavy eyelids, and difficulty concentrating.
Feeling comfortable and relaxed.
Feeling hungry and slightly thirsty.
Wanting to adjust the cabin temperature.

Warning signs of driver fatigue can include repeated yawning, heavy eyelids, difficulty concentrating, wandering thoughts, and trouble maintaining a steady road position. These signs mean you should stop and rest before continuing.

Driver showing signs of fatigue
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should cyclists do when cycling downhill?

474. What should cyclists do when cycling downhill?

Use only one brake to reduce the risk of skidding.
Brake as late as possible before bends.
Look only at the road directly in front of you.
✓ Control your speed and keep both hands ready to brake.

Higher speed increases stopping distance and reduces reaction time. Maintain a speed that allows you to stop safely.

Cyclist riding down a hill
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What can happen if you use the brakes continuously on a long descent?

475. What can happen if you use the brakes continuously on a long descent?

Nothing, if the brake fluid level is correct.
The engine may automatically slow the vehicle.
The brakes will automatically cool while being used.
✓ The brakes may overheat and become less effective.

Continuous braking can cause the brakes to overheat and fade, reducing braking performance. Use a lower gear to help control speed with engine braking.

Vehicle braking during a long descent
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if you realise you have put the wrong fuel in your vehicle?

476. What should you do if you realise you have put the wrong fuel in your vehicle?

✓ Do not start the engine, and seek assistance.
Rev the engine briefly to mix the fuels.
Drive until the fuel warning light comes on.
Start the engine and drive slowly to use the fuel.

If you have used the wrong fuel, do not start the engine. Starting it can circulate the incorrect fuel and cause further damage. If possible, avoid switching on the ignition and seek appropriate roadside or workshop assistance.

Fuel nozzle and the risk of misfuelling
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if you approach slow-moving farm machinery?

477. What should you do if you approach slow-moving farm machinery?

Overtake as soon as the road becomes slightly wider.
Use your horn so the driver moves aside.
✓ Keep a safe distance and overtake only when safe.
Overtake even if the vehicle is signalling to turn.

Farm machinery may be wide, slow, or turn unexpectedly. Keep distance and only overtake when you have a clear view and enough space.

Vehicle approaching slow-moving farm machinery
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if your lane is blocked by an obstacle?

478. What should you do if your lane is blocked by an obstacle?

Follow another vehicle around it without checking yourself.
Signal and expect oncoming traffic to make room.
Speed up to keep traffic flowing around the obstacle.
✓ Slow down, check carefully, and give way if needed.

If your lane is blocked, reduce speed, check mirrors and oncoming traffic, and only move around the obstacle when it is safe.

Obstacle blocking a vehicle's lane
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You should signal before turning or changing lanes.

479. You should signal before turning or changing lanes.

✓ True.
False.

A clear signal helps other road users understand your intentions, but you must still check that the manoeuvre can be made safely.

Vehicle signalling before a turn
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you check blind spots before moving off?

480. Why should you check blind spots before moving off?

To check whether the road ahead is clear.
To judge the speed of traffic approaching from behind.
✓ A cyclist, pedestrian, or vehicle may be beside you.
To make sure your mirrors are adjusted correctly.

Mirrors do not show every area around your vehicle. A blind-spot check can reveal cyclists, pedestrians, motorcyclists, or vehicles before you move off.

Driver checking a blind spot before moving off
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the button on a seat-belt buckle used for?

481. What is the button on a seat-belt buckle used for?

✓ To release the seat belt.
To adjust the belt height.
To tighten the shoulder belt.
To lock the seat in position.

Pressing the button on the seat-belt buckle releases the latch so the belt can be unfastened. Keep the seat belt fastened whenever required while the vehicle is moving.

Release button on a seat-belt buckle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do around a damaged electric or hybrid vehicle?

482. What should you do around a damaged electric or hybrid vehicle?

✓ Keep clear of damaged high-voltage components and call trained assistance.
Assume the system is safe once the vehicle is switched off.
Move damaged high-voltage parts away from the road.
Inspect damaged cables closely before calling for help.

Electric and hybrid vehicles can contain dangerous high-voltage systems. Do not touch damaged cables, batteries, or electrical components.

Damaged electric vehicle and high-voltage safety risks
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Which gear is used to drive a manual vehicle backwards?

483. Which gear is used to drive a manual vehicle backwards?

2nd gear.
1st gear.
Neutral.
✓ R (Reverse).

Select R (Reverse) when you need to drive a manual vehicle backwards. The vehicle should be stationary before Reverse is selected.

Manual gear lever and gear-selection pattern
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You should check your mirrors before changing lanes.

484. You should check your mirrors before changing lanes.

✓ True.
False.

Checking your mirrors helps you see surrounding traffic before moving into another lane.

Driver checking a mirror before changing lanes
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
When should you use rear fog lights?

485. When should you use rear fog lights?

When another vehicle is following closely.
When driving on an unlit road.
When driving on high-speed roads at night.
✓ When visibility is seriously reduced by fog or similar conditions.

Rear fog lights are very bright and should only be used when visibility is poor enough to require them.

Rear fog lights used in severely reduced visibility
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when approaching a stop sign?

486. What should you do when approaching a stop sign?

✓ Come to a complete stop before proceeding.
Slow down and stop only if traffic is approaching.
Give way without stopping if the road is clear.
Stop only after entering the junction.

A stop sign requires you to come to a complete stop at the required position. Check carefully for other road users and proceed only when it is safe.

Vehicle approaching a stop sign
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the general minimum legal tread depth for car tyres in Thailand?

487. What is the general minimum legal tread depth for car tyres in Thailand?

2.0 mm.
1.5 mm.
1.0 mm.
✓ 1.6 mm.

The general minimum legal tread depth for car tyres in Thailand is 1.6 mm. Higher minimums may apply to winter tyres, during winter periods or in winter conditions.

Measuring tread depth on a vehicle tyre
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do before overtaking a slow-moving vehicle?

488. What should you do before overtaking a slow-moving vehicle?

Signal first and then check whether there is enough space.
Use your horn to make the driver move aside.
Follow another vehicle that starts overtaking ahead of you.
✓ Check that the road ahead is clear and that overtaking is safe.

Before overtaking, make sure you have enough visibility, space, and time. Signal clearly before moving out, do not exceed the speed limit, and never overtake if the road ahead is not clear.

Vehicle preparing to pass slow-moving traffic
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What is the best place to cross the road?

489. What is the best place to cross the road?

Between parked vehicles if traffic appears quiet.
Near a bend if approaching traffic seems slow.
At a junction without checking for turning traffic.
✓ At a designated crossing.

Use a designated crossing whenever possible. It is usually the safest place to cross the road.

Designated crossing for pedestrians
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do with the clutch during emergency braking in a manual vehicle?

490. What should you do with the clutch during emergency braking in a manual vehicle?

Release it suddenly.
✓ Press it fully while maintaining firm brake pressure.
Keep it partly pressed.
Pump it repeatedly.

During emergency braking in a manual vehicle, maintain firm pressure on the brake and press the clutch pedal fully so the engine does not stall as the vehicle slows. Do not reduce braking pressure while operating the clutch.

Brake and clutch operation during an emergency stop
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should the seat-belt height be adjusted correctly?

491. Why should the seat-belt height be adjusted correctly?

To increase the length of the lap belt.
To make the belt easier to unfasten.
✓ To position the shoulder belt correctly across the body.
To prevent the seat from moving.

The seat-belt height adjustment helps position the shoulder belt correctly across the chest and shoulder. It should not run across the neck or under the arm.

Height adjustment for the shoulder section of a seat belt
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you switch on dipped headlights before entering a tunnel?

492. Why should you switch on dipped headlights before entering a tunnel?

To reduce tyre wear inside the tunnel.
To reduce fuel consumption.
✓ To improve visibility and help other road users see you.
To keep the windscreen from misting.

Tunnel lighting may be much darker than daylight. Dipped headlights help you see and make your vehicle more visible.

Vehicle using dipped headlights before entering a tunnel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you brake on a slippery road?

493. How should you brake on a slippery road?

Steer sharply while braking to avoid slippery areas.
Brake harder than usual to shorten the stopping distance.
✓ Brake gently and progressively.
Use the parking brake to help slow the vehicle.

Sudden braking can cause the wheels to lose grip. Smooth, progressive braking reduces the risk of skidding.

Braking on a slippery road surface
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should the windscreen washer reservoir contain suitable washer fluid?

494. Why should the windscreen washer reservoir contain suitable washer fluid?

Washer fluid is needed only in freezing weather.
✓ It helps remove dirt, salt, insects, and spray from the windscreen.
The reservoir needs fluid only when the windscreen is visibly dirty.
Plain water always cleans the windscreen just as well.

A clear windscreen is essential for safe observation. Suitable washer fluid helps clean the glass and may provide protection against freezing in cold conditions.

Windscreen washer-fluid reservoir in a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why is it dangerous to cross while listening to loud music?

495. Why is it dangerous to cross while listening to loud music?

✓ You may not hear approaching traffic.
Drivers may not hear you crossing.
You may not see approaching traffic clearly.
It makes you walk more slowly across the road.

Loud music can reduce your awareness of vehicles, bicycles, horns, and other warning sounds.

Pedestrian listening to music while crossing the road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Who normally has priority at roundabouts in Thailand?

496. Who normally has priority at roundabouts in Thailand?

Traffic entering the roundabout.
✓ Traffic already on the roundabout.

In Thailand, traffic entering a roundabout normally gives way to traffic already circulating.

Vehicles approaching and circulating on a roundabout
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

497. What does this vehicle-control symbol indicate?

Front windscreen demister.
Windscreen wiper speed.
✓ Windscreen washer.
Air recirculation.

This symbol indicates the windscreen washer. Operating the control sprays washer fluid onto the windscreen and normally activates the wipers to help clean the glass.

Windscreen-washer control and spray symbol
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should a bicycle helmet fit?

498. How should a bicycle helmet fit?

Tilted back to keep your forehead clear.
Loose enough to move slightly on your head.
✓ Level, secure, and comfortably fitted.
High on the head with the straps loose.

A helmet should sit level on the head and remain securely in place so it can provide effective protection.

Bicycle helmet positioned securely on the rider's head
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

499. What does this dashboard symbol indicate?

✓ Brake-system warning.
Anti-lock braking system warning.
Low tyre pressure.
Parking brake applied.

This symbol indicates a possible brake-system fault. If it remains illuminated after the parking brake is released, stop safely and have the braking system checked.

Brake-system warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does a green traffic light mean?

500. What does a green traffic light mean?

You have priority over all other road users.
✓ You may proceed if it is safe.
You may turn in any direction without checking the signs.
You must proceed as soon as the light turns green.

A green light allows you to continue, but you must still watch for pedestrians, cyclists, and other road users.

Green traffic light at a junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA