Why Japan’s Roads Last for Decades 😱 | Japanese Road Construction Secrets

Added: 2026-05-25

[00:00:00]Look, in Japan road construction is considered the gold standard of civil engineering because here more than speed the focus is on perfection and durability. First the foundation of the road is built which is an extremely strong base layer about 30 cm thick.

[00:00:09]This layer carries the weight of all the traffic. On top of that a smooth final layer of around 5 cm is added which not only looks perfect but also makes sure at every stage strict checks are carried out for leveling, compaction, and surface quality. Even the slightest defect is not tolerated. Using special sealing techniques even the tiny micro holes inside the road are closed. That is why despite rain, snow, and heavy traffic the roads do not break apart and last not just for years but for decades.