RoadworksThailand

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.


10. Roadworks

Roadworks are construction, maintenance, repair or inspection activities carried out on or beside a road. They may temporarily change the road layout, lane widths, speed limits, priority, permitted directions and facilities for pedestrians or cyclists.

Drivers must follow the temporary signs, traffic lights, barriers, road markings and instructions from authorised personnel. They should reduce speed, increase their following distance and remain prepared for narrow lanes, stopped traffic, workers, machinery and sudden changes in the route.

Roadworks
Roadworks warning sign. (Thailand)
Wikimedia.org • CEphoto, Uwe Aranas • CC BY-SA
What should you watch for when approaching roadworks in Thailand?

Look for temporary warnings, cones, barriers, narrow lanes and construction vehicles. Road layouts can change temporarily, including lane shifts, traffic-light control and short one-way sections. Expect workers and slow or stationary traffic near the worksite.

🔗 aipalync.org • Thailand — Road Traffic Act 21, 33, 43, 67–74 and 139, actual controls and safe movement

🔗 laksong.metro.police.go.th • Official Police-hosted Gazette — full enacted Road Traffic Act amendment 13, 2022

Is a temporary speed limit at roadworks binding in Thailand?

Where an authorised temporary regulatory speed limit is in force, you must obey it. A roadworks warning alone should not be mistaken for a new numerical limit, but conditions may require driving more slowly.

🔗 aipalync.org • Thailand — Road Traffic Act 21, 33, 43, 67–74 and 139, actual controls and safe movement

🔗 laksong.metro.police.go.th • Official Police-hosted Gazette — full enacted Road Traffic Act amendment 13, 2022

What if only one lane remains open through roadworks in Thailand?

Follow the temporary signals, stop/go instructions, lane arrows and priority signs. Do not enter an opposing traffic lane until permitted, and give vulnerable road users and road workers extra room.

🔗 aipalync.org • Thailand — Road Traffic Act 21, 33, 43, 67–74 and 139, actual controls and safe movement

🔗 laksong.metro.police.go.th • Official Police-hosted Gazette — full enacted Road Traffic Act amendment 13, 2022

Warning for roadworks. Warning for roadworks.

English • Traffic sign ตก.3 • Workers ahead. Workers may be on or near the carriageway. Reduce speed and watch for people, equipment and temporary instructions.

ไทย • ตก.3 • คนทำงาน. ข้างหน้ามีคนทำงานบนผิวจราจรหรือใกล้ผิวจราจร ให้ลดความเร็วและระวังคนงาน เครื่องมือ และคำสั่งชั่วคราว

Sources

🔗 Commons.wikimedia.org
🔗 Doh.go.th • กรมทางหลวง • คู่มือ พ.ศ. 2561 • เล่ม 3 • หน้า PDF 49

SVG source: Government of Thailand • Public domain • Original revision 2018-01-27. Wikimedia original unmodified.

1 Thailand 2 Speed limit 3 Minimum speed 4 Advisory speed 5 Slope 6 Stop sign 7 School area 8 Crossing animals 9 Curve 10 Roadworks 11 Traffic lights 12 Left-hand traffic 13 Driving licence 14 Reversing 15 Uncontrolled crossroad 16 Licence plate 17 Bus 18 Police 19 Ambulance 20 Pothole 21 Path 22 Particulates 23 Air pollution 24 Rush hour 25 Road code 26 Street gutter 27 Cargo bike 28 Lane splitting 29 Forestry vehicle 30 Construction vehicle 31 Semi-trailer truck 32 Trolleybus 33 Speed pedelec 34 Delivery vehicle 35 Idling 36 Tow truck 37 Four-wheel drive 38 Bicycle 39 Motorcycle equipment 40 Rail track 41 Caravan 42 Trailer 43 Tow hitch 44 Fire truck 45 Siren 46 Convoy 47 Emergency vehicle lighting 48 Agricultural machinery 49 Electric bicycle 50 Electric vehicle 51 Pedelec 52 Quadricycle 53 Microcar 54 All-terrain vehicle 55 Van 56 Recreational vehicle 57 Scooter 58 Trikke 59 Personal mobility device 60 Skateboard 61 Segway 62 Kick scooter 63 Roller skates 64 Mailman 65 Hitchhiker 66 Toddler 67 Child 68 Disability 69 Motorail 70 km/h 71 mph 72 Speedometer 73 Ride height 74 Dirt road 75 Driving 76 Start-stop system 77 Manual transmission 78 Automatic transmission 79 Throttle 80 Tachometer 81 Steering wheel 82 Power steering 83 Visual scanning 84 Mirror 85 Fuel 86 Fuel gauge 87 Petrol 88 Diesel 89 Diesel exhaust fluid 90 Car insurance 91 First aid kit 92 Fire extinguisher 93 High-visibility clothing 94 First aid 95 Concrete step barrier 96 Barriers 97 Vehicle lights 98 Street lights 99 Dipped beam 100 High beam ...