warning sign
Slippery road
Thai road sign ต.38 — Slippery road. Meaning: The road surface ahead may be slippery, often due to weather, oil, or a surface change. 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: ป้ายเตือนทางลื่น
Independent English reference · Source: Department of Highways · Sign ต.38
Road response
On the road
Driver action
What should you do?
The driver should reduce speed and avoid sudden braking, accelerating, or steering inputs.
Exam-style scenario
Read the situation
Rain has started and this sign warns that grip can be lost on the surface ahead.
Best response: Lower speed on the wet surface and make braking, steering, and acceleration inputs gradually.
Sign comparison
Don’t confuse it
This sign
Slippery road
Compare with
Loose road surface ahead
Key difference
Skid tracks behind the car warn of reduced grip; the loose-surface sign shows stones thrown from the tyres.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
