At 805 metres long, I believe the M898 is currently the shortest and highest-numbered UK Motorway.
But can it be a "proper" motorway if it does not have hard sholders?
via wiki
The M898 motorway is a 1⁄2-mile (0.80 km) motorway in Renfrewshire, Scotland. It is a spur route from the M8 motorway towards the Erskine Bridge. It is the highest numbered motorway in the United Kingdom, and also the shortest. It lacks hard shoulders along its length.
That map is a A3 size 1986 edition. Getting a bit tatty now, and of course well out of date, but always kept in my cab as you can't trust Sat Nav's. Must admit I have never heard of the M898 ? Thankfully don't go that far northwards these days.
I wonder why the M898 wasn't considered as an M8 spur? The M25 has loads of M25 spurs but I wonder if they are counted in the overall length of the M25?
Often wondered, we have roads and motorways but no highways, yet we have a highways agency.
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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