The "route bus priority lane" marking indicates a lane reserved exclusively for route buses.

Explanation

Marking No. 16 designates a priority lane for route buses, not an exclusive lane. Exclusive lanes are marking No. 15.

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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