prohibition sign
Speed limit (20 km/h)
Thai road sign บ.32-20 — Speed limit (20 km/h). Meaning: Drivers must not exceed 20 km/h from this sign onward. Catalog status: additional official road-sign reference.
Thai name: ป้ายจำกัดความเร็ว
Independent English reference · Source: Department of Highways · Sign บ.32-20
Road response
On the road
Driver action
What should you do?
Drivers must not exceed 20 km/h from this sign onward.
Exam-style scenario
Read the situation
You enter a signed 20 km/h section while travelling at 32 km/h.
Best response: Reduce from 32 km/h before continuing through the signed 20 km/h section.
Sign comparison
Don’t confuse it
This sign
Speed limit (20 km/h)
Compare with
Speed limit (10 km/h)
Key difference
The numeral 20 sets a 20 km/h maximum; the matching 10 sign imposes a limit half as high.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
