warning sign
Sharp curve ahead
Thai road sign ต.4 — Sharp curve ahead. Meaning: This sign warns that a sharp curve lies ahead. 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: ป้ายเตือนทางโค้งรัศมีแคบ
Independent English reference · Source: Department of Highways · Sign ต.4
Road response
On the road
Driver action
What should you do?
Reduce speed before entering the curve and keep to your lane throughout.
Exam-style scenario
Read the situation
The warning shows a tight right bend just beyond the crest of the road.
Best response: Approach the crest at a reduced speed so the tight right bend can be taken under control.
Sign comparison
Don’t confuse it
This sign
Sharp curve ahead
Compare with
Sharp left curve ahead
Key difference
The angular symbol shows a sharp right bend; the mirrored sign warns that the sharp bend is to the left.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
