Side road merging from left ahead
A side road joins your road from the left ahead. Be prepared for vehicles entering your lane from the left and watch for traffic that may merge without yielding. Adjust speed and position as needed.
Verified as Thai road sign ต.46 from Thai Department of Land Transport sign series on 2026-05-15.
Study guide
Connect this sign to practice
Side road merging from left ahead is a hazard cue, not a rule. On the Thai exam that distinction matters. Run a few questions to see how the scenario gets framed: which way to slow, who has priority, and what the next sign is likely to be.
Now see it in questions.
Spotting Side road merging from left ahead 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.
