Distribution of road tunnel soundness in Japan 2022

Distribution of inspection results of road tunnel conditions in Japan as of March 2022

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Release date

September 2022

Region

Japan

Survey time period

fiscal years 2014 to 2021; the Japanese fiscal years run from April 1 of the stated year to March 31 of the followig year

Special properties

not including facilities under inspection as of March 31, 2022; 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.

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