warning sign
Narrow bridge ahead
Thai road sign ต.25 — Narrow bridge ahead. Meaning: A narrow bridge lies ahead. 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: ป้ายเตือนสะพานแคบ
Independent English reference · Source: Department of Highways · Sign ต.25
Road response
On the road
Driver action
What should you do?
Reduce speed and be prepared for limited lane width or opposing traffic.
Exam-style scenario
Read the situation
A bridge ahead is visibly narrower than the approach road and an oncoming truck is near its entrance.
Best response: Slow before the bridge and let the oncoming truck clear if both vehicles cannot pass with safe space.
Sign comparison
Don’t confuse it
This sign
Narrow bridge ahead
Compare with
Roadway narrows ahead on both sides
Key difference
The bridge symbol identifies a constrained structure specifically; the converging roadway sign warns of narrowing without identifying a bridge.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
