Turn left only
Drivers must turn left at the junction ahead and must not go straight or turn right.
Verified as Thai road sign บ.43 from Thai Department of Land Transport sign series on 2026-05-15.
Study guide
Connect this sign to practice
On the Thai theory exam, mandatory signs like Turn left only get paired with multi-step scenarios: sequence of turns, lane assignments, intersection priority. Reviewing it next to similar signs in the flow makes those scenarios feel familiar instead of fresh.
Now see it in questions.
Spotting Turn left only in isolation is one thing. Recognising it inside a real exam-style question, among lookalikes and trick wording, is another. The diagnostic mixes it in for you.
