Near the crest of a hill visibility is poor, so slow to a crawl — and overtaking there is prohibited.

Explanation

Correct. You cannot see oncoming traffic beyond the crest, so you must slow right down, and overtaking is banned.

Guides that explain this

• Overtaking and Lane Rules in Japan: Where It Is Banned, and How
• Entering a Japanese Expressway: Acceleration Lane and Minimum Speed

Related terms

• Overtaking (oikoshi)
• Slowing down (jokō)

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