mandatory sign
One-way straight ahead
Thai road sign บ.37 — One-way straight ahead. Meaning: Traffic on the road ahead must travel straight in the direction shown by the arrow. 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: ป้ายเดินรถทางเดียวไปข้างหน้า
Independent English reference · Source: Department of Highways · Sign บ.37
Road response
On the road
Driver action
What should you do?
Traffic on the road ahead must travel straight in the direction shown by the arrow. Drivers must not drive against the one-way direction.
Exam-style scenario
Read the situation
At a junction, the only blue arrow points ahead while the street beyond carries traffic in one direction.
Best response: Continue straight with the one-way flow and do not turn into or against the signed direction.
Sign comparison
Don’t confuse it
This sign
One-way straight ahead
Compare with
No entry
Key difference
The blue arrow confirms the permitted one-way direction ahead; the red No entry sign faces traffic that may not enter from that end.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
