- Lightweight bridges are used to carry potable water and pedestrians across river spans up to 632 m in Japan
- 85% Type 304
- 10% Type 316
- Some 2205 near the coast
- No repainting
- 40% cheaper over 30 years
- First one built: 1983
- Max pipe diameter: 0.8 m
- There are now ~3000 such bridges in Japan
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