No 3-wheeled motor vehicles
3-wheeled motor vehicles are prohibited from entering or travelling on the road ahead. Drivers of such vehicles must not pass this sign. Note that tuk-tuks and similar 3-wheeled motorised vehicles fall under this prohibition.
Verified as Thai road sign บ.18 from Thai Department of Land Transport sign series on 2026-05-15.
Study guide
Connect this sign to practice
Prohibition signs like No 3-wheeled motor vehicles 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 3-wheeled motor vehicles 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.
