Left curve ahead
The road ahead curves to the left. Reduce speed and keep control before entering the curve.
Verified as Thai road sign ต.1 from Department of Rural Roads sign series on 2026-05-15.
Study guide
Connect this sign to practice
Left curve ahead 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 Left curve ahead 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.
