Roadway narrows ahead on both sides
The road ahead becomes narrower from both sides. Reduce speed and be prepared to adjust your road position as the usable width of the carriageway decreases. Take extra care when meeting oncoming vehicles or overtaking.
Verified as Thai road sign ต.22 from Thai Department of Land Transport sign series on 2026-05-15.
Study guide
Connect this sign to practice
Roadway narrows ahead on both sides is a hazard cue, not a rule. On the Thai exam that distinction matters. Run a few questions to see how the scenario gets framed: which way to slow, who has priority, and what the next sign is likely to be.
Now see it in questions.
Spotting Roadway narrows ahead on both sides in isolation is one thing. Recognising it inside a real exam-style question, among lookalikes and trick wording, is another. The diagnostic mixes it in for you.
