What does this warning sign tell you to do?

Reduce speed because a curve is ahead.

Stop completely because a junction is ahead.

Increase speed before the road climbs uphill.

Move to the right lane because the left lane ends.

A red circular sign displays '10' with text below it. Which vehicles are prohibited from passing this sign?

Any vehicle with a total weight above 10 tonnes

Any vehicle carrying more than 10 passengers

Any vehicle longer than 10 metres

Any vehicle travelling faster than 10 km/h

A warning sign shows traffic lights ahead. What should you do?

Reduce speed and be ready to stop or go according to the traffic lights ahead.

Maintain your speed — the lights are for cross traffic only.

Slow down and prepare to yield to pedestrians crossing ahead.

Stop immediately and wait for a flagger to direct you through.

You are approaching this give-way sign. What should you do?

Slow down and give way to traffic on the road you are entering.

Prepare to make a U-turn at the junction ahead.

Merge into a single lane because two-way traffic begins ahead.

Stop completely every time, even when there is no traffic.

What does this sign tell truck drivers?

Trucks of all kinds are forbidden from entering the road ahead.

Trucks must stop and wait for clearance before proceeding.

Only heavy trucks over a certain weight are restricted; light trucks may pass.

Trucks may use this road only during off-peak hours.

This warning sign is posted ahead. What road condition should you prepare for?

A severely uneven surface with potholes or bumps

A slippery road surface due to rain or oil

Loose gravel or stones scattered across the road

Falling rocks from a slope beside the road

Do I need to memorise every Thai road sign?

No. Learn the four shape-and-colour groups first — red circle, blue circle, yellow diamond, blue rectangle — and most signs become a matching exercise instead of memorisation.

Are the signs on the test the same as in my home country?

Mostly the shapes match international convention, but several Thai-specific signs (school zones, U-turn pictograms, weight limits) come up often and trip up first-time foreign candidates.

Which sign categories should I prioritise first?

Start with warning diamonds and prohibition circles because they carry the clearest rule changes. Then add mandatory blue circles and information rectangles so you can answer by sign family before reading the icon.

Thai road signs, decoded.

Thai road signs follow four shape-and-colour groups: red circle for prohibition, blue circle for mandatory, yellow diamond for warning, blue rectangle for information. The exam asks you to match the shape to the rule before it asks you to recognise the icon.

Practise signs deep dive Back to questions

Rule pattern

Shape first, icon second.

Read the shape and the colour before the picture. Red circle is always a 'you may not.' Blue circle is always a 'you must.' Yellow diamond warns of a hazard ahead. Blue rectangle gives information.

The common Thai road-sign families, grouped by what their shape and colour mean. Skim once and the lookalikes stop looking alike.

Written by a farang who failed once — independent of the Thai Department of Land Transport. About FarangDrive.

Frequently confused

A · Red circle

Prohibition. 'You may not do X.' A red circle with a vehicle silhouette means that class of vehicle is forbidden on the road ahead.

B · Yellow diamond

Warning. 'Hazard ahead, prepare to react.' Yellow diamond signs don't prohibit anything; they tell you what's coming.

The difference: A red circle stops you from doing something. A yellow diamond tells you something is about to happen.

Honest answers

Common signs deep dive questions

Real questions foreigners ask before the theory test. Practice content is based on common Thai driving-test topics and public guidance; it is not an official exam database.

Do I need to memorise every Thai road sign?
No. Learn the four shape-and-colour groups first — red circle, blue circle, yellow diamond, blue rectangle — and most signs become a matching exercise instead of memorisation.
Are the signs on the test the same as in my home country?
Mostly the shapes match international convention, but several Thai-specific signs (school zones, U-turn pictograms, weight limits) come up often and trip up first-time foreign candidates.
Which sign categories should I prioritise first?
Start with warning diamonds and prohibition circles because they carry the clearest rule changes. Then add mandatory blue circles and information rectangles so you can answer by sign family before reading the icon.

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