| 11. | Lyttelton is Christchurch's port, linked to the town by a two-kilometre road tunnel.
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| 12. | On completion, it is expected to be India's longest road tunnel.
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| 13. | A road tunnel was proposed in 1979, but not considered viable.
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| 14. | What makes up the greatest costs in building shallow road tunnels?
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| 15. | A fourth tunnel, the Yinhang Road Tunnel is currently under construction.
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| 16. | It is the only road tunnel crossed by the Appalachian Trail.
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| 17. | The tunnel's average elevation at is below the existing road tunnel.
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| 18. | The long road tunnel reaches a depth of below sea level.
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| 19. | These deficiencies were addressed during the refurbishment of the original road tunnel in 2011.
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| 20. | When the road tunnel opened, traffic dropped by 80 %.
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