Temporary traffic-control sign
Workers ahead
Thai road sign ตก.3 — Workers ahead. Meaning: People are working ahead on or close to the carriageway. Learner-manual coverage: this identity is shown in the current DLT car-driver learner manual. Inclusion does not mean it appears in every theory test.
Thai name: ป้ายเตือนคนทำงาน
Independent English reference · Source: Department of Highways · Sign ตก.3
Road response
On the road
Driver action
What should you do?
People are working ahead on or close to the carriageway. Reduce speed before the signed condition and keep enough space to respond safely.
Exam-style scenario
Read the situation
A crew member is working near the live lane beyond this worker-symbol warning.
Best response: Slow before reaching the crew and keep a safe distance from the worker near the live lane.
Sign comparison
Don’t confuse it
This sign
Workers ahead
Compare with
Construction machinery ahead
Key difference
The human worker pictogram highlights people near the live road; the machinery sign depicts construction plant instead.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
