prohibition sign
Width limit (2.5 metres)
Thai road sign บ.34 — Width limit (2.5 metres). Meaning: Vehicles wider than 2.5 metres must not pass beyond this sign. 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: ป้ายจำกัดความกว้าง
Independent English reference · Source: Department of Highways · Sign บ.34
Road response
On the road
Driver action
What should you do?
Do not proceed if the vehicle or its load is wider than 2.5 metres; take an alternative route before the restriction.
Exam-style scenario
Read the situation
A truck is 2.7 metres wide across its load and approaches this 2.5-metre restriction.
Best response: Do not take the 2.7-metre-wide truck past the 2.5-metre limit; leave by another route.
Sign comparison
Don’t confuse it
This sign
Width limit (2.5 metres)
Compare with
Width restriction ahead (2.5 metres)
Key difference
The red-ring sign is the 2.5-metre prohibition point; the yellow diamond gives advance warning before that point.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
