warning sign
Roadway narrows ahead on both sides
Thai road sign ต.22 — Roadway narrows ahead on both sides. Meaning: The road ahead becomes narrower from both sides. 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: ป้ายเตือนทางแคบ
Independent English reference · Source: Department of Highways · Sign ต.22
Road response
On the road
Driver action
What should you do?
Reduce speed and be prepared to adjust your road position as the usable width of the carriageway decreases.
Exam-style scenario
Read the situation
Parked construction barriers reduce both edges of the carriageway beyond this warning.
Best response: Slow before the barriers, centre the vehicle safely, and allow space for traffic through the narrower width.
Sign comparison
Don’t confuse it
This sign
Roadway narrows ahead on both sides
Compare with
Roadway narrows ahead on the left side
Key difference
Both edges move inward in the symbol, so the entire carriageway narrows; the one-sided version shows only the left edge closing in.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
