An emergency vehicle running on expressway main lanes has a maximum speed of 100 km/h.

Explanation

Article 27(2) states that emergency vehicles on expressway main lanes, acceleration lanes or deceleration lanes have a maximum speed of 100 km/h, regardless of the other rules.

Guides that explain this

• Stopping Distance in Japan: Reaction Distance + Braking Distance
• Overtaking and Lane Rules in Japan: Where It Is Banned, and How

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