warning sign
Reverse curve ahead
Thai road sign ต.5 — Reverse curve ahead. Meaning: The road ahead bends in two successive curves in opposite directions. 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: ป้ายเตือนทางโค้งกลับ
Independent English reference · Source: Department of Highways · Sign ต.5
Road response
On the road
Driver action
What should you do?
Reduce speed before the first bend and stay in your lane through both changes of direction.
Exam-style scenario
Read the situation
Two bends follow in quick succession, beginning to the left before changing direction.
Best response: Slow before the first left bend and remain controlled as the road immediately turns back right.
Sign comparison
Don’t confuse it
This sign
Reverse curve ahead
Compare with
Reverse curve ahead, first to the right
Key difference
The first sweep goes left before returning right; the companion reverse-curve sign begins to the right.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
