No trailers
Vehicles towing a trailer or semi-trailer are prohibited from entering or travelling on the road ahead.
Verified as Thai road sign บ.17 from Department of Rural Roads sign series on 2026-05-15.
Study guide
Connect this sign to practice
Prohibition signs like No trailers carry instant fines on the road and trick wording on the exam. Questions test where the rule starts, where it ends, and which adjacent signs cancel it. Practising it in the question flow keeps those edges fresh.
Now see it in questions.
Spotting No trailers 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.
