prohibition sign
No trailers
Thai road sign บ.17 — No trailers. Meaning: Vehicles towing a trailer or semi-trailer are prohibited from entering or travelling on the road 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: ป้ายห้ามรถพ่วง
Independent English reference · Source: Department of Highways · Sign บ.17
Road response
On the road
Driver action
What should you do?
Vehicles towing a trailer or semi-trailer are prohibited from entering or travelling on the road ahead.
Exam-style scenario
Read the situation
Your pickup is towing a small trailer when this sign appears before a constrained route.
Best response: Do not take the pickup-and-trailer combination onto the constrained route.
Sign comparison
Don’t confuse it
This sign
No trailers
Compare with
No trucks
Key difference
The trailer symbol excludes towing combinations; the truck silhouette excludes the truck class itself.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
