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Distribution of inspection results of road tunnel conditions in Japan as of March 2025

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Source

Release date

August 2025

Region

Japan

Survey time period

March 2025

Special properties

classification after close visual inspection into stages*

Supplementary notes

*Stage I: Good. No structural deficiency.
Stage II: Preventive maintenance. Preventive maintenance is desirable, although no structural deficiency is found.
Stage III: Early rehabilitation. The structure needs early rehabilitation, or it can become deficient.
Stage IV: Emergency rehabilitation. The structure needs emergency rehabilitation because it is deficient or it will most likely become deficient.

Percentages may not total 100 due to rounding by the source.

Citation formats

Distribution of road tunnel soundness in Japan 2025

Published by ÌÇÐÄÆƽâ°æ Research Department, Aug 26, 2025

As of March 31, 2025, around *** percent of road tunnels in Japan were in a critical condition that required immediate action to restore the structural integrity. In the course of the past ten years, approximately  thousand tunnels received a close visual inspection.

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Road infrastructure in JapanAutomobile industry in JapanPublic transport in JapanTravel and tourism industry in JapanConstruction industry in Japan
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