Advisory speedJapan
Traffic rules
Japan
1. Advisory speed
An advisory speed is a recommended speed for a particular road section or hazard rather than a legally imposed maximum speed. It may be shown near bends, junctions, steep gradients, roadworks or other locations where a lower speed can help drivers negotiate the road safely.
Drivers should treat an advisory speed as guidance for safe driving conditions and should travel even more slowly when weather, visibility, traffic or road conditions require it. A separate legally binding speed limit must still be obeyed.
Is Japan’s new 30 km/h ordinary-road default an advisory speed?
No. From 1 September 2026, the 30 km/h figure is a statutory maximum for qualifying ordinary-road layouts, not merely advice. The change does not cover every ordinary road, and designated speed signs can establish another limit.
🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 22–23 and 70
🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text
🔗 laws.e-gov.go.jp • e-Gov — current enforced decree revision metadata
Can a speed recommendation override a lower restriction in Japan?
No. A recommendation must be read within the applicable legal maximum. Lower signed, vehicle-specific or temporary restrictions still govern. Use the rule for the actual road and vehicle rather than treating a recommended number as permission to exceed it.
🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 22–23 and 70
🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text
🔗 laws.e-gov.go.jp • e-Gov — current enforced decree revision metadata
May I drive below a recommended speed when conditions worsen in Japan?
Yes. A recommendation is not a guarantee that the speed is safe for your vehicle or the conditions. Slow for limited visibility, poor grip, traffic or another hazard, and keep enough space to stop safely. Apply any specific legal minimum together with its traffic and safety exceptions.
🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 22–23 and 70
🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text
🔗 laws.e-gov.go.jp • e-Gov — current enforced decree revision metadata
