Road narrowingJapan

An introduction to the traffic rules and road signs of Japan. Learn about driving, road safety and much more in our illustrated book, with answers to frequently asked questions.

For informational purposes only. Always follow official regulations. Some content and images were created with AI assistance.


20. Road narrowing

A road narrowing is a section where the available width of the road or carriageway becomes smaller. The narrowing may occur on both sides, on one side only, or because one or more traffic lanes end.

Drivers should reduce speed, observe approaching and adjacent traffic, maintain sufficient lateral clearance and merge when necessary. Warning signs do not always determine priority, so drivers must follow any priority signs, lane markings and local traffic rules.

Road narrowing
What does a road-narrowing warning mean in Japan?

Japanese narrowing warnings identify reduced road width. Keep to the required side, reduce speed for conditions and follow the actual traffic controls; the warning itself is different from a priority or Stop instruction.

🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 7–9, 17–43, 44–45 and 70: actual controls and safe circulation

🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text

🔗 npa.go.jp • NPA — Traffic Lights and Road Signs, official English definitions

🔗 npa.go.jp • NPA — traffic instruction handbook, sign groups and road use; read with current Act

Warning for a road narrowing. Warning for a road narrowing.

English • Traffic sign 212 • Road width decreases. Watch clearance from oncoming vehicles.

日本語 • 212 • 幅員減少。 この先で道路の幅が狭くなります。対向車との間隔に注意してください。

Sources

🔗 Commons.wikimedia.org
🔗 Laws.e-gov.go.jp • 道路標識、区画線及び道路標示に関する命令、別表第一・第二
🔗 Mlit.go.jp • 国土交通省、道路標識一覧

SVG source: Monaneko • Public domain • Original revision 2013-06-19. Wikimedia original unmodified.

Warning for a road narrowing on the left. Warning for a road narrowing on the left.

English • Traffic sign 211 • Lane reduction. The left lane ends ahead. Check surrounding traffic and change lanes with a safe gap.

日本語 • 211 • 車線数減少。 この先で左側の車線がなくなります。周囲を確認し、安全な間隔を確保して車線を移ってください。

Sources

🔗 Commons.wikimedia.org
🔗 Laws.e-gov.go.jp • 道路標識、区画線及び道路標示に関する命令、別表第一・第二
🔗 Mlit.go.jp • 国土交通省、道路標識一覧

SVG source: Monaneko • Public domain • Original revision 2013-06-19. Wikimedia original unmodified.

Does a narrowing warning give you priority in Japan?

No. A warning describes the reduced width, rather than allocating priority or setting a numerical speed limit. Follow any separate priority signs, signals and meeting rules, and slow enough to pass safely or wait before entering.

🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 7–9, 17–43, 44–45 and 70: actual controls and safe circulation

🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text

🔗 npa.go.jp • NPA — Traffic Lights and Road Signs, official English definitions

🔗 npa.go.jp • NPA — traffic instruction handbook, sign groups and road use; read with current Act

What should you do if traffic lanes merge at a narrowing in Japan?

Read the lane-ending signs and markings, check surrounding traffic and signal any lane change as required. Apply the local merging rule and enter only when safe. Do not assume the driver in an ending lane always has priority, or confuse merging with meeting oncoming traffic.

🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 7–9, 17–43, 44–45 and 70: actual controls and safe circulation

🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text

🔗 npa.go.jp • NPA — Traffic Lights and Road Signs, official English definitions

🔗 npa.go.jp • NPA — traffic instruction handbook, sign groups and road use; read with current Act

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