prohibition sign
Height limit (2.5 metres)
Thai road sign บ.35 — Height limit (2.5 metres). Meaning: Vehicles exceeding 2.5 metres in height 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: ป้ายจำกัดความสูง
Independent English reference · Source: Department of Highways · Sign บ.35
Road response
On the road
Driver action
What should you do?
Do not proceed if the vehicle, roof load, or equipment is higher than 2.5 metres; take an alternative route before the restriction.
Exam-style scenario
Read the situation
A van measures 2.4 metres high before roof cargo is added, making its total height 2.7 metres at this sign.
Best response: Count the roof cargo in the 2.7-metre total and do not pass the 2.5-metre height limit.
Sign comparison
Don’t confuse it
This sign
Height limit (2.5 metres)
Compare with
Height restriction ahead (2.5 metres)
Key difference
The red-ring sign enforces the 2.5-metre height limit at its location; the yellow warning appears earlier so over-height vehicles can leave.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
