Temporary traffic-control sign
Shoulder work ahead
Thai road sign ตค.12 — Shoulder work ahead. Meaning: Work is taking place on the road shoulder ahead. Catalog status: additional official road-sign reference.
Thai name: ป้ายเตือนงานไหล่ทาง
Independent English reference · Source: Department of Highways · Sign ตค.12
Road response
On the road
Driver action
What should you do?
Drivers should slow down, keep clear of workers and equipment, and be prepared for narrowed usable road space.
Exam-style scenario
Read the situation
Workers occupy the shoulder while the traffic lane remains open immediately beside them.
Best response: Slow down and leave as much safe clearance as possible for the workers beside the open lane.
Sign comparison
Don’t confuse it
This sign
Shoulder work ahead
Compare with
Construction materials on shoulder
Key difference
The shoulder-work warning indicates people or operations beside the lane; the materials sign identifies stored construction material on the shoulder.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
