Prohibitory signsThailand

An introduction to the traffic rules and road signs of Thailand. Learn about driving, road safety and much more in our illustrated book, with answers to frequently asked questions.

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

Traffic signs

Traffic rules

Prohibitory signs

A prohibitory sign is a traffic sign that tells drivers what is not allowed on that specific road or in that situation. These signs impose restrictions such as no entry, no overtaking, no parking, speed limits, or bans on certain types of vehicles. Their purpose is to clearly indicate actions that are forbidden to ensure safety, maintain traffic flow, and protect vulnerable road users.

Vehicles higher than indicated prohibited.

Road narrowing, give way to oncoming drivers.

1. No entry

This traffic sign means no entry. Drivers may not enter from the direction in which the sign is placed.

2. Trucks prohibited

This traffic sign indicates that trucks are prohibited. Trucks covered by the sign may not enter or continue beyond it. Any applicable weight threshold or vehicle-category limitation is determined by the sign, supplementary information and local rules.

3. Vehicles higher than indicated prohibited

This traffic sign indicates that vehicles higher than indicated are prohibited. A vehicle or vehicle combination whose overall height, including its load, exceeds the displayed limit may not continue beyond the sign.

4. Road narrowing, give way to oncoming drivers

This traffic sign indicates a road narrowing where you must give way to oncoming traffic. Allow approaching traffic to pass before entering or continuing through the narrow section when required.

5. Turning left prohibited

This traffic sign indicates that turning left is prohibited. A left turn may not be made where the sign applies. Other movements may still be permitted unless another restriction applies.

6. Turning right prohibited

This traffic sign indicates that turning right is prohibited. A right turn may not be made where the sign applies. Other movements may still be permitted unless another restriction applies.

7. Turning around prohibited (U-turn)

This traffic sign indicates that turning around (making a U-turn) is prohibited. A U-turn may not be made where the prohibition applies. Other movements may still be permitted unless another restriction applies.

8. Overtaking prohibited

This traffic sign indicates that overtaking is prohibited. The vehicles covered by the prohibition and any categories that may still be overtaken depend on the applicable local rules.

9. Start of a speed limit

This traffic sign indicates the start of a speed limit. The displayed value is the maximum permitted speed from this point. The limit remains in force until it ends or is replaced according to the applicable traffic signs and local rules.

10. Entry prohibited (checkpoint)

This traffic sign indicates a checkpoint with restricted entry. Road users may not proceed beyond the checkpoint unless they are authorised or permitted to continue according to the applicable rules and instructions.

11. Parking prohibited

This traffic sign indicates that parking is prohibited. Vehicles may not be parked in the area covered by the sign unless an exception applies. Brief stopping to pick up or drop off passengers or to load or unload goods may still be permitted where local rules allow it.

12. Parking and stopping prohibited

This traffic sign indicates that parking and stopping are prohibited. Vehicles may not stop or park voluntarily where the restriction applies, except where an applicable rule provides an exemption or stopping is required by traffic conditions.