Many years since I have been along the Snake Pass, but for anyone in south/ west of Sheffield getting to Manchester without it is a headache, but as the Woodhead exists it appears that'll do!
It suffers a similar issue to the A59 between Harrogate and Skipton. Built on hills made of peat and little solid geology so landslips are common. Mam Tor was another alternative route, but that closed years ago and will never reopen, Winnats, Rushup is very scenic, but not a route for heavy traffic.
A59 is being rerouted and the new alignment is along the top of the hills, rather than on the slope, but as that's the only route (and also serves Menwitn Hill RAF/ US Airforce base!) a solution had to be found and funded,
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