Around 1960 the M57 was suggested. To minimise the snow problem the uphill side was on a bottom deck under the downhill side.
HS2 is a ridiculous waste of money. We don’t need it.
Now we have the M18 link to Finningley we don’t need another runway in the south-east.
Why should we have a 400-mile round trip when we can reduce pollution and congestion in the south-east by flying locally?