warning sign
Width restriction ahead (2.5 metres)
Thai road sign ต.31 — Width restriction ahead (2.5 metres). Meaning: Gives advance warning that a 2.5-metre width restriction is 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: ป้ายเตือนความกว้าง
Independent English reference · Source: Department of Highways · Sign ต.31
Road response
On the road
Driver action
What should you do?
Check the vehicle's full width and leave the route before the upcoming restriction if it exceeds 2.5 metres.
Exam-style scenario
Read the situation
Your vehicle is 2.6 metres wide and this warning gives time to turn off before a 2.5-metre restriction.
Best response: Use the advance warning to leave the route before the 2.6-metre vehicle reaches the 2.5-metre restriction.
Sign comparison
Don’t confuse it
This sign
Width restriction ahead (2.5 metres)
Compare with
Width limit (2.5 metres)
Key difference
The yellow diamond announces a 2.5-metre width limit farther ahead; the red-ring sign marks where the prohibition takes effect.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
