Surveying, Construction and Geology
| Tsugaru Strait traffic data | |||
|---|---|---|---|
| Year | Passengers (persons/yr) |
Freight (T/yr) | Mode |
| 1955 | 2,020,000 | 3,700,000 | Seikan Ferry |
| 1965 | 4,040,000 | 6,240,000 | Seikan Ferry |
| 1970 | 9,360,000 | 8,470,000 | Seikan Ferry |
| 1985 | 9,000,000 | 17,000,000 | 1971 Forecast |
| 1988 | ~3,100,000 | — | Seikan Tunnel |
| 1999 | ~1,700,000 | — | Seikan Tunnel |
| 2001 | — | >5,000,000 | Seikan Tunnel |
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