The A6091 between Melrose and Newtown St Boswells was rerouted in December 1995. At the same time, a section of the B6361 between Newstead and Leaderfoot was also closed off, rendered redundant by a new link to the rerouted A6091.R Iason wrote: ↑Sun Dec 12, 2021 05:28 Few ones in Scotland spring to mind.
A6091 - Melrose to Newton St Boswells section closed off and re routed (not sure when). Old section still largely intact when I walked it couple years ago.
A93 - Craighall Gorge north of Blairgowrie (bypassed in 2008).
A8 - Coatbridge Bypass. Not physically abandoned as such but with the newest section of the M8 completed a few years ago the A8 still being dual carriageway does seem somewhat redundant.
The ultimate abandonments have to be the old A625 at Mam Tor and the old A3 east of Hindhead. The former due to subsidence, the latter due to the opening of the Hindhead Tunnel. I think the old A69 at Greenhead must be in with a shout, too.