Work-zone detour to the left
Traffic must follow a temporary detour to the left through or around a road-work zone. Reduce speed and follow the indicated direction.
Verified as Thai road sign ตค.24 from Department of Highways sign series on 2026-05-15.
Study guide
Connect this sign to practice
Most candidates can describe Work-zone detour to the left. The Thai exam tests whether you can pick it out of a roadside scene under time pressure and choose the right response. Practising it inside the question flow is what closes that gap.
Now see it in questions.
Spotting Work-zone detour to the left 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.
