prohibition sign
Speed limit (120 km/h)
Thai road sign บ.32-120 — Speed limit (120 km/h). Meaning: Drivers must not exceed 120 km/h on the road section ahead. Catalog status: additional official road-sign reference.
Thai name: ป้ายจำกัดความเร็ว
Independent English reference · Source: Department of Highways · Sign บ.32-120
Road response
On the road
Driver action
What should you do?
Do not exceed 120 km/h after passing this sign, and drive more slowly when conditions require it.
Exam-style scenario
Read the situation
A motorway section displays 120 km/h, although congestion ahead is moving well below that speed.
Best response: Match the slower congestion safely; 120 km/h is a maximum, not a speed that must be maintained.
Sign comparison
Don’t confuse it
This sign
Speed limit (120 km/h)
Compare with
Speed limit (110 km/h)
Key difference
The middle digit is 2, so the maximum is 120 km/h; 110 uses a second 1 instead.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
