warning sign
Roadway narrows ahead on the right side
Thai road sign ต.24 — Roadway narrows ahead on the right side. Meaning: The road ahead becomes narrower on the right side. 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: ป้ายเตือนทางแคบ
Independent English reference · Source: Department of Highways · Sign ต.24
Road response
On the road
Driver action
What should you do?
Reduce speed and keep safely clear of the right-hand edge as the usable carriageway narrows.
Exam-style scenario
Read the situation
The right edge narrows toward your lane before an oncoming vehicle reaches the same point.
Best response: Reduce speed and keep clear of the narrowing right edge before meeting the oncoming vehicle.
Sign comparison
Don’t confuse it
This sign
Roadway narrows ahead on the right side
Compare with
Roadway narrows ahead on the left side
Key difference
The right boundary line moves inward while the left stays straight; the companion sign mirrors that change on the left.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
