prohibition sign
Speed limit (100 km/h)
Thai road sign บ.32-100 — Speed limit (100 km/h). Meaning: Drivers must not exceed 100 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.32-100
Road response
On the road
Driver action
What should you do?
Drivers must not exceed 100 km/h on the road section ahead.
Exam-style scenario
Read the situation
A 100 km/h sign begins a new section, but the wet surface makes that speed unsafe.
Best response: Drive below the 100 km/h maximum because the wet surface requires a safer, lower speed.
Sign comparison
Don’t confuse it
This sign
Speed limit (100 km/h)
Compare with
Speed limit (90 km/h)
Key difference
Three digits identify the 100 km/h limit; the similar red-ring sign showing 90 is 10 km/h lower.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
