Roundabout ahead
A roundabout lies ahead. Reduce speed and prepare to follow roundabout priority and lane discipline.
Verified as Thai road sign ต.21 from Department of Rural Roads sign series on 2026-05-15.
Study guide
Connect this sign to practice
Roundabout ahead sits in a cluster of warning signs that look uncomfortably similar. The Thai exam exploits that overlap. Reviewing it next to its visual neighbours in the question flow keeps the differences sharp on test day.
Now see it in questions.
Spotting Roundabout ahead 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.
