No left turn or U-turn
Drivers must not turn left or make a U-turn at this location. Both manoeuvres are prohibited from the point where the sign is posted.
Verified as Thai road sign บ.13 from Department of Rural Roads sign series on 2026-05-15.
Study guide
Connect this sign to practice
No left turn or U-turn is one of the prohibition signs candidates lose marks on. Not because the symbol is unfamiliar, but because the question reframes the scenario. Practising it in the flow surfaces those reframings before test day.
Now see it in questions.
Spotting No left turn or U-turn 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.
