No horn
Drivers must not use the horn or make unnecessary noise in the area where this sign is posted.
Verified as Thai road sign บ.27 from Department of Rural Roads sign series on 2026-05-15.
Study guide
Connect this sign to practice
No horn 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 horn 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.
