mandatory sign
Turn left or right only
Thai road sign บ.45 — Turn left or right only. Meaning: Drivers must turn left or right at the junction ahead and must not continue straight. 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: ป้ายให้เลี้ยวซ้ายหรือเลี้ยวขวา
Independent English reference · Source: Department of Highways · Sign บ.45
Road response
On the road
Driver action
What should you do?
Drivers must turn left or right at the junction ahead and must not continue straight.
Exam-style scenario
Read the situation
The road terminates at a junction and the sign shows two permitted turning directions but no straight movement.
Best response: Choose either permitted turn at the road end and do not try to continue straight.
Sign comparison
Don’t confuse it
This sign
Turn left or right only
Compare with
Straight or left only
Key difference
Its arrows permit the two turns but exclude straight ahead; Straight or left includes forward travel and excludes the right turn.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
