warning sign
Sharp reverse curves ahead — first left
Thai road sign ต.7 — Sharp reverse curves ahead — first left. Meaning: Warns of two successive sharp curves, first to the left and then to the right. 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: ป้ายเตือนทางโค้งกลับรัศมีแคบ
Independent English reference · Source: Department of Highways · Sign ต.7
Road response
On the road
Driver action
What should you do?
Warns of two successive sharp curves, first to the left and then to the right. Reduce speed before the signed condition and keep enough space to respond safely.
Exam-style scenario
Read the situation
A mountain road enters two tight bends, first left and then right, with little straight road between them.
Best response: Enter the first tight left bend slowly and hold a safe lane position through the immediate right bend.
Sign comparison
Don’t confuse it
This sign
Sharp reverse curves ahead — first left
Compare with
Sharp reverse curve ahead, first to the right
Key difference
Its angular double-bend begins with a sharp left; the mirrored version begins with a sharp right.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
