mandatory sign
Roundabout
Thai road sign บ.48 — Roundabout. Meaning: Drivers entering the roundabout must circulate to the left and yield to traffic already moving around the roundabout. Learner-manual coverage: this identity is shown in the current DLT car-driver learner manual. Inclusion does not mean it appears in every theory test.
Thai name: ป้ายวงเวียน
Independent English reference · Source: Department of Highways · Sign บ.48
Road response
On the road
Driver action
What should you do?
Drivers entering the roundabout must circulate to the left and yield to traffic already moving around the roundabout.
Exam-style scenario
Read the situation
You approach a roundabout entry while a vehicle is already circulating from your right.
Best response: Slow at the entry, yield to the vehicle already circulating, then join when a safe gap opens.
Sign comparison
Don’t confuse it
This sign
Roundabout
Compare with
Roundabout ahead
Key difference
The blue circular sign gives the mandatory circulation at the roundabout; the yellow diamond only warns that the roundabout is approaching.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
