prohibition sign
No left turn or U-turn
Thai road sign บ.13 — No left turn or U-turn. Meaning: Drivers must not turn left or make a U-turn at this location. 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: ป้ายห้ามเลี้ยวซ้ายหรือกลับรถ
Independent English reference · Source: Department of Highways · Sign บ.13
Road response
On the road
Driver action
What should you do?
Drivers must not turn left or make a U-turn at this location. Both manoeuvres are prohibited from the point where the sign is posted.
Exam-style scenario
Read the situation
You approach a left-side junction where this sign rules out both the side-road turn and reversing direction.
Best response: Continue without taking the left road or making a U-turn, and find a permitted alternative.
Sign comparison
Don’t confuse it
This sign
No left turn or U-turn
Compare with
No right turn or U-turn
Key difference
This combined symbol bars both the left turn and the U-turn shown; its companion combines the U-turn ban with a right-turn ban.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
