prohibition sign
No changing lanes to the right
Thai road sign บ.11 — No changing lanes to the right. Meaning: Drivers must not change lanes to the right where this sign is posted. 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: ป้ายห้ามเปลี่ยนช่องเดินรถไปทางขวา
Independent English reference · Source: Department of Highways · Sign บ.11
Road response
On the road
Driver action
What should you do?
Drivers must not change lanes to the right where this sign is posted. Remain in your current lane until the restriction no longer applies.
Exam-style scenario
Read the situation
A faster lane opens to your right, but this sign controls your current section of road.
Best response: Remain in the current lane and do not move into the faster lane while the restriction applies.
Sign comparison
Don’t confuse it
This sign
No changing lanes to the right
Compare with
No changing lanes to the left
Key difference
The bent lane-change arrow moves right, prohibiting only that lateral move; the companion sign bars a move to the left.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
