On the "left turn permitted" sign board, the arrow and the frame are blue and the background is white.

Explanation

As stated in Appendix Table 2 (2), the "left turn permitted" board has a blue arrow and blue frame on a white background.

Guides that explain this

• Japanese Signs That Mean the Opposite of What You Assume: Crosswind, End of Restriction, Minimum Speed
• Japanese Road Signs on the Written Test: The 5 Types Explained

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