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QuizTraffic rulesThailand

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

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

Traffic signs
Traffic rules
Thailand
True/false 17 Thailand 17 Car controls 109 Dashboard lights 40 Priority rules 9 Pedestrians 19 Cyclists 20 Show all 584
What does this dashboard symbol indicate?

101. What does this dashboard symbol indicate?

✓ Low engine coolant level.
Engine overheating.
Low engine oil.
Low washer fluid.

This symbol indicates that the engine coolant level is low. Check the coolant level when the engine is cool and refill it with the correct coolant if necessary.

Low coolant-level warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should pedestrians avoid sudden movements near traffic?

102. Why should pedestrians avoid sudden movements near traffic?

Drivers always expect pedestrians to walk straight.
✓ Drivers may not have enough time to react.
Pedestrians are only allowed to walk slowly.
You lose priority if you change direction suddenly.

Sudden movements can surprise drivers and reduce the time they have to slow down or stop safely.

Pedestrian movements close to road traffic
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

103. What does this dashboard symbol indicate?

Electronic stability control.
✓ Automatic start-stop system.
Anti-theft system.
Cruise control.

This symbol relates to the automatic start-stop system, which can switch the engine off temporarily while the vehicle is stationary and restart it when driving resumes. The exact colour and appearance may vary between vehicles.

Automatic start-stop system symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you normally do after completing an overtake?

104. What should you normally do after completing an overtake?

Move back immediately in front of the vehicle you passed.
✓ Return to the normal driving lane when it is safe.
Stay beside the vehicle until there is another reason to change lanes.
Remain in the overtaking lane until another vehicle approaches.

After overtaking, return to the normal driving lane when you have passed the other vehicle by a safe distance. Check your mirrors, signal when appropriate, and avoid moving back too soon.

Vehicle returning to its lane after overtaking
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if EV charging equipment becomes unusually hot or smells burnt?

105. What should you do if EV charging equipment becomes unusually hot or smells burnt?

Pour water over the equipment to cool it.
Keep charging until the vehicle reaches full charge.
Cover the equipment to contain the heat.
✓ Stop the charging session, keep clear, and report the fault.

Unusual heat, a burning smell, smoke, sparks, or repeated charging faults can indicate an electrical problem. Stop using the charging equipment if it is safe to do so, keep clear of anything damaged or overheating, and report the fault or seek appropriate assistance.

Faulty electric-vehicle charging equipment
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
You must stop at a red traffic light.

106. You must stop at a red traffic light.

✓ True.
False.

A red traffic light means you must stop and wait until it is allowed to proceed.

Vehicle stopped at a red traffic light
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when driving on icy roads?

107. What should you do when driving on icy roads?

Follow the vehicle ahead more closely for guidance.
Use quick steering corrections if the vehicle starts to slide.
Brake firmly before bends to reduce speed.
✓ Drive slowly and avoid sudden braking, steering, or acceleration.

Ice greatly reduces tyre grip. Drive gently, keep extra distance, and avoid sudden movements that could cause a skid.

Vehicle travelling on an icy road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if another vehicle is tailgating you?

108. What should you do if another vehicle is tailgating you?

Speed up to create more space behind you.
Move toward the centre to discourage them from passing.
✓ Stay calm and increase your safety margin ahead.
Tap the brakes to make them increase their distance.

If someone follows too closely, avoid sudden actions. Keeping more space in front gives you more time to brake gently if needed. If it is safe, allow the tailgating vehicle to pass.

Following vehicle visible close behind
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if another vehicle is signalling to turn?

109. What should you do if another vehicle is signalling to turn?

Assume the driver has seen you.
✓ Do not rely on the signal alone, proceed only when it is safe.
Use your horn and proceed immediately.
Pull out because the vehicle will turn.

An indicator shows an intention, but it does not guarantee that the driver will turn. The signal may have been left on accidentally or the driver's intentions may change. Observe the vehicle's speed and position and proceed only when you are sure it is safe.

Another vehicle signalling to turn
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if your brakes feel less effective after driving through water?

110. What should you do if your brakes feel less effective after driving through water?

Increase speed to warm the brakes.
Brake hard several times to dry them quickly.
✓ Drive carefully and test them gently when safe.
Use only the parking brake until they dry.

Water can reduce braking performance. After driving through water, check the brakes gently when it is safe to do so.

Checking braking response after driving through water
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should a motorcyclist brake in an emergency?

111. How should a motorcyclist brake in an emergency?

✓ Apply both brakes firmly and progressively.
Grab the front brake as suddenly as possible.
Use only the rear brake.
Steer sharply while braking hard.

During emergency braking, use both brakes firmly and progressively while keeping the motorcycle as upright and stable as practical. Avoid sudden steering. If ABS is fitted, maintain firm braking pressure and allow the system to work.

Motorcyclist making an emergency stop
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you use the brake pedal during emergency braking in a vehicle with ABS?

112. How should you use the brake pedal during emergency braking in a vehicle with ABS?

Release it if the pedal vibrates.
✓ Press it firmly and keep it pressed.
Use the parking brake instead.
Pump it rapidly.

During emergency braking with ABS, press the brake pedal firmly and keep it pressed. Pulsation or vibration through the pedal can be normal while ABS is operating, so do not pump or release the brake.

Firm brake-pedal pressure during emergency braking with ABS
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does the single-wipe position of the windscreen-wiper control do?

113. What does the single-wipe position of the windscreen-wiper control do?

✓ Operates the windscreen wipers once.
Sprays washer fluid onto the windscreen.
Runs the wipers continuously.
Activates the rear wiper.

The single-wipe position operates the windscreen wipers for one sweep and then stops. It is useful when only a small amount of water or spray needs to be cleared from the windscreen.

Single-wipe setting on the windscreen-wiper control
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid driving too close to the edge of the road?

114. Why should you avoid driving too close to the edge of the road?

It can reduce the effectiveness of your mirrors.
✓ The edge may be uneven or weak.
It can make the steering require more effort.
It can make your speed harder to judge.

Road edges can be soft, uneven, or damaged. Driving too close to the edge can reduce control or cause the vehicle to leave the road.

Vehicle travelling close to the road edge
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you normally do before changing gear in a manual vehicle?

115. What should you normally do before changing gear in a manual vehicle?

✓ Press the clutch pedal fully.
Press the accelerator pedal fully.
Apply the parking brake.
Switch off the engine.

Pressing the clutch pedal disconnects the engine from the transmission so that another gear can be selected. After changing gear, the clutch should be released smoothly.

Clutch operation when changing gear in a manual vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if the pedestrian light is red?

116. What should you do if the pedestrian light is red?

Cross if another pedestrian has already started.
Cross if nearby vehicles appear to have stopped.
Start crossing if the signal is about to change.
✓ Wait until it turns green.

A red pedestrian signal means you should wait before crossing.

Red pedestrian signal at a crossing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when driving through heavy rain?

117. What should you do when driving through heavy rain?

✓ Reduce speed and increase your following distance.
Accelerate through the rain to clear it more quickly.
Use main beam to improve visibility.
Drive closer to the vehicle ahead for guidance.

Heavy rain reduces grip and visibility. Lower speed and extra distance give you more time to react safely.

Vehicle travelling through heavy rain
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

118. What does this dashboard symbol indicate?

Power-steering warning.
Engine-management warning.
✓ Immobiliser or anti-theft system.
Charging-system warning.

This symbol relates to the vehicle's immobiliser or anti-theft system. If it remains illuminated or flashes unexpectedly, the vehicle may not recognise the key or there may be a fault in the security system.

Immobiliser indicator symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if traffic beyond a railway crossing is blocked?

119. What should you do if traffic beyond a railway crossing is blocked?

Cross quickly before the warning signals activate.
Enter the crossing and wait for traffic to move.
✓ Wait until there is enough space to clear the tracks completely.
Stop on the tracks if no train is visible.

Never enter a railway crossing unless you can clear the tracks completely. If traffic ahead is blocked, wait before the crossing so you cannot become trapped on the railway.

Congested traffic beyond a railway crossing
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
When should you fasten your seat belt?

120. When should you fasten your seat belt?

Only when driving at high speed.
Only on long journeys.
Only when traffic is heavy.
✓ Before the vehicle starts moving.

Fasten your seat belt before the vehicle starts moving and keep it fastened throughout the journey. Make sure your passengers are also safely seated and properly restrained.

Fastening a seat belt before setting off
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How should you use the clutch and accelerator when moving off?

121. How should you use the clutch and accelerator when moving off?

Keep the clutch fully pressed while accelerating.
✓ Release the clutch smoothly while applying the accelerator progressively.
Release the clutch suddenly without using the accelerator.
Press the brake and accelerator together.

When moving off, release the clutch pedal smoothly through the biting point while applying the accelerator progressively. This helps the vehicle move away smoothly without stalling or excessive engine speed.

Coordinating the clutch and accelerator when moving off
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
How can the parking brake help when moving off uphill?

122. How can the parking brake help when moving off uphill?

It releases the clutch.
✓ It can prevent the vehicle from rolling backwards.
It increases engine power.
It selects a lower gear automatically.

When moving off uphill, the parking brake can hold the vehicle stationary while you prepare to move. Release it smoothly once the clutch reaches the biting point and sufficient power is applied.

Parking-brake control during an uphill start
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

123. What does this dashboard symbol indicate?

Rear fog lights.
Charging-system warning.
Engine-management warning.
✓ Exterior-light failure.

This symbol indicates a possible failure of an exterior vehicle light, such as a headlight, tail light, brake light or indicator. Check the vehicle's exterior lights and replace or repair any faulty light.

Exterior-light failure warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if your motorcycle helmet visor starts to fog?

124. What should you do if your motorcycle helmet visor starts to fog?

Close all helmet vents completely.
Wipe the inside of the visor while riding.
Look around the side of the visor instead.
✓ Reduce speed and clear the visor safely.

A fogged visor can seriously reduce your view of the road. Reduce speed and use the helmet's ventilation, demisting or anti-fog features where available. If you cannot restore a clear view safely, stop in a safe place before continuing.

Misted visor on a motorcycle helmet
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if the oil-pressure warning light stays on?

125. What should you do if the oil-pressure warning light stays on?

✓ Stop safely, switch off the engine, and seek assistance.
Increase the engine speed until the light goes out.
Continue slowly until you reach a service station.
Ignore it if the engine sounds normal.

Low oil pressure can quickly cause severe engine damage. Stop as soon as it is safe, switch off the engine, and investigate the cause before continuing.

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

126. What does this vehicle-control symbol indicate?

✓ Cabin temperature adjustment.
Cabin fan speed.
Air conditioning.
Air recirculation.

This control adjusts the temperature of the air supplied to the cabin. Turning it towards the blue side lowers the selected temperature, while turning it towards the red side raises it.

Control for adjusting the cabin temperature
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you be extra careful at night?

127. Why should you be extra careful at night?

Road markings become less important.
Street lighting makes drivers less alert.
Vehicles need more distance to accelerate.
✓ Visibility is reduced.

At night, it is harder to see pedestrians, cyclists, road markings, and hazards. Reduce speed and use the correct lights.

Road traffic in reduced night-time visibility
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you leave extra space behind a vehicle climbing a steep hill?

128. Why should you leave extra space behind a vehicle climbing a steep hill?

Its tyres may warm up more quickly.
Its engine may become louder on the hill.
✓ It may slow down suddenly or roll backward.
Its headlights may point higher uphill.

Vehicles may lose speed or briefly roll backward when starting on a steep incline. Extra space gives you more time to react.

Vehicle following another up a steep hill
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

129. What does this dashboard symbol indicate?

✓ Service or maintenance required.
Brake-system warning.
Charging-system warning.
Engine-management warning.

This symbol indicates that the vehicle requires servicing or maintenance. The exact meaning and required maintenance can vary between vehicles, so check the vehicle information display or owner's manual.

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

130. What does this dashboard symbol indicate?

✓ Low fuel level.
Low engine oil.
Engine-temperature warning.
Low washer fluid.

This symbol indicates that the fuel level is low. Refuel soon to reduce the risk of running out of fuel.

Low-fuel warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should an unused roof rack or roof box be removed?

131. Why should an unused roof rack or roof box be removed?

It reduces the vehicle's braking power.
It prevents the battery from charging.
✓ It can increase aerodynamic drag and energy use.
It increases tyre pressure.

An unused roof rack or roof box increases aerodynamic drag, particularly at higher speeds. Removing it when it is not needed can reduce fuel or energy consumption.

Roof rack or roof box fitted to a vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if another driver behaves aggressively towards you?

132. What should you do if another driver behaves aggressively towards you?

Respond with your horn and gestures.
Stop beside them so you can discuss the problem.
✓ Stay calm, avoid confrontation, and create more distance.
Speed up to prevent them from passing you.

If another driver behaves aggressively, do not retaliate or become involved in a confrontation. Stay calm, increase the distance between you, and let the other vehicle move away when possible. If you feel threatened, go to a safe public place and seek appropriate assistance.

Driver facing aggressive behaviour from another road user
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

133. What does this vehicle-control symbol indicate?

✓ Rear window wiper.
Windscreen wiper.
Windscreen washer.
Rear window demister.

This symbol controls the rear window wiper. Depending on the vehicle, the same control may also operate the rear-window washer.

Rear-window wiper control and symbol
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you look well ahead while driving?

134. Why should you look well ahead while driving?

✓ To identify developing hazards early and gain more time to react.
To concentrate only on traffic in your lane.
To avoid checking your mirrors as often.
To follow the vehicle ahead more closely.

Looking well ahead helps you identify developing hazards early, such as slowing traffic, pedestrians, junctions, or changing road conditions. Earlier detection gives you more time to assess the situation and respond smoothly and safely.

Driver observing the road and traffic ahead
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do with the parking brake when parking on a slope?

135. What should you do with the parking brake when parking on a slope?

✓ Apply it firmly.
Release it completely.
Use it only if the engine is running.
Leave it partly applied.

When parking on a slope, apply the parking brake firmly to help prevent the vehicle from rolling. Selecting an appropriate gear or Park provides additional security.

Using the parking brake when parking on a slope
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should you avoid changing lanes inside an intersection?

136. Why should you avoid changing lanes inside an intersection?

It can make it harder to maintain a steady speed.
It can reduce the effectiveness of your indicators.
✓ It can confuse other road users and increase collision risk.
It can make your route through the junction longer.

Changing lanes inside an intersection can surprise drivers, cyclists, and pedestrians. It is safer to choose the correct lane before entering.

Vehicle changing lanes within a junction
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should cyclists do when riding over loose gravel or road debris?

137. What should cyclists do when riding over loose gravel or road debris?

Keep the same speed as on a dry, smooth road.
Accelerate to keep the bicycle stable.
Make quick steering movements to avoid loose stones.
✓ Reduce speed and steer smoothly.

Loose material reduces tyre grip. Smooth steering and controlled speed lower the chance of losing balance.

Cyclist riding over loose gravel
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

138. What does this vehicle-control symbol indicate?

Adaptive cruise control.
✓ Speed limiter.
Cruise control.
Driving mode selection.

The speed limiter allows the driver to set a maximum speed that the vehicle should not normally exceed while the accelerator is being used.

Vehicle speed-limiter control and symbol
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if animals are gathered beside a narrow rural road?

139. What should you do if animals are gathered beside a narrow rural road?

✓ Reduce speed and pass only when there is enough space.
Drive close to prevent them entering your lane.
Maintain speed because the animals are beside the road.
Sound your horn so the animals move away.

Animals beside a narrow road may step into your path. Slow down and leave as much safe space as possible.

Animals gathered beside a narrow rural road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do if visibility is reduced by fog?

140. What should you do if visibility is reduced by fog?

Use main beam to see further through the fog.
Follow the vehicle ahead closely as a guide.
Use hazard lights instead of normal headlights.
✓ Slow down and use the correct lights.

Fog makes it harder to see and be seen. Reduce speed, increase following distance, and use the correct lights.

Fog reducing visibility on a road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this dashboard symbol indicate?

141. What does this dashboard symbol indicate?

Electronic stability control.
✓ Anti-lock braking system warning.
Brake-pad wear warning.
Low tyre pressure.

This symbol indicates a possible fault with the anti-lock braking system (ABS). Normal braking may still be available, but ABS may not operate during heavy braking, so the system should be checked.

Anti-lock braking system warning symbol on the dashboard
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you expect when leaving a sheltered area during strong winds?

142. What should you expect when leaving a sheltered area during strong winds?

The vehicle may automatically slow down.
Higher speed limits.
Your steering may become lighter.
✓ A sudden gust may affect your vehicle.

Buildings, trees, and other obstacles can block wind. When you leave shelter, a sudden gust may push your vehicle.

Vehicle leaving a sheltered stretch of road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when branches or debris are blowing onto the road?

143. What should you do when branches or debris are blowing onto the road?

Change lanes immediately without reducing speed.
Maintain speed and steer around them when necessary.
✓ Slow down and avoid hazards safely.
Follow the vehicle ahead closely for protection.

Wind can blow unexpected obstacles onto the road. Reduce speed and avoid them safely.

Wind-blown branches and debris on a road
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you normally do with the accelerator when changing to a higher gear?

144. What should you normally do with the accelerator when changing to a higher gear?

Keep it pressed at the same position.
Press the brake pedal instead.
Press it fully while pressing the clutch.
✓ Ease off it while pressing the clutch.

When changing to a higher gear, ease off the accelerator as you press the clutch and select the next gear. Release the clutch smoothly and then apply the accelerator progressively.

Changing to a higher gear in a manual vehicle
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

145. What does this vehicle-control symbol indicate?

✓ Air recirculation.
Air conditioning.
Front windscreen demister.
Rear window demister.

This symbol activates air recirculation, which reduces the amount of outside air entering the vehicle and recirculates air already inside the cabin. It can be useful when driving through polluted air or when cooling the interior quickly.

Cabin air-recirculation control and symbol
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
When should you select P (Park) in an automatic vehicle?

146. When should you select P (Park) in an automatic vehicle?

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

Select P (Park) only after the vehicle has come to a complete stop. Selecting Park while the vehicle is moving can damage the transmission.

Selecting Park after an automatic vehicle stops
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should motorcyclists take extra care on wet road markings?

147. Why should motorcyclists take extra care on wet road markings?

They can increase the motorcycle's engine temperature.
They can cause the tyre pressure to rise suddenly.
✓ They can provide less grip than the surrounding road.
They can make the brakes overheat.

Wet painted road markings can provide less grip than the surrounding road surface. Ride smoothly over them and avoid sudden braking, acceleration or steering that could cause the tyres to lose grip.

Motorcycle approaching wet painted road markings
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What should you do when joining a motorway from an entry lane?

148. What should you do when joining a motorway from an entry lane?

Merge as soon as the entry lane begins.
✓ Match your speed, check around you, and merge into a safe gap.
Stop at the end of the entry lane and wait for a large gap.
Force your way into the nearest gap.

Use the entry lane to build a suitable speed, check carefully, signal, and merge only when it is safe.

Vehicle joining a motorway from an entry lane
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

149. What does this vehicle-control symbol indicate?

Child safety lock.
Boot release.
Mirror adjustment.
✓ Central door locking.

This control operates the vehicle's central door locking system. Pressing it locks or unlocks the vehicle's doors, depending on the current lock state.

Central door-locking control and symbol
AI-generated by Traffic-rules.com • WCIT • CC BY-SA
Why should motorcyclists take extra care on wet metal covers?

150. Why should motorcyclists take extra care on wet metal covers?

✓ They can provide much less grip than the surrounding road.
They can cause the tyre pressure to rise suddenly.
They can make the tyres overheat.
They can increase the motorcycle's braking power.

Wet metal surfaces, such as drain or inspection covers, can provide much less grip than the surrounding road. Cross them smoothly, keep the motorcycle as upright as practical and avoid sudden braking, acceleration or steering.

Wet metal cover in a motorcycle's path
AI-generated by Traffic-rules.com • WCIT • CC BY-SA