We need investment in a network of tunnels to take strain off our roads

Norwegian ferries are held up as an example for Scotland by Dave McEwan Hill as an alternative to the Rest and be Thankful road link (Letters, August 6).

However, Norway itself provides a much better example if we want a modern and convenient transport system in Scotland.

Over the last couple of decades Norway has cut 700 km of tunnels at a cost of under £5 million per km. If this is technically possible on that side of the North Sea, it is here too. Indeed a Norwegian company offered to cut one tunnel between the Shetland mainland and Yell for a quoted price of £23m.

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