prohibition sign
No agricultural vehicles
Thai road sign บ.22 — No agricultural vehicles. Meaning: Agricultural vehicles are not permitted on this road. 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: ป้ายห้ามรถยนต์ที่ใช้ในการเกษตร
Independent English reference · Source: Department of Highways · Sign บ.22
Road response
On the road
Driver action
What should you do?
Drivers of tractors, combine harvesters, and similar farm machinery must not proceed beyond this sign.
Exam-style scenario
Read the situation
A tractor driver reaches this sign while travelling from a field toward the next village.
Best response: Turn the tractor onto a permitted route rather than entering the restricted road toward the village.
Sign comparison
Don’t confuse it
This sign
No agricultural vehicles
Compare with
No 3-wheeled motor vehicles
Key difference
Its tractor-like machinery pictogram excludes agricultural vehicles; the three-wheeler sign targets a different powered vehicle class.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
