The M7 - Scotland’s ’Missing’ Motorway? 

I've never heard of this proposal before - it might have been useful, even as an alternative route south from Perth, Dundee, etc (via the M90/M8). As someone who travels "down South" a few times per year from Inverness, I might have used that route instead of A9/M9/M80/M73, etc. Agree that this road is gone, never to be seen. I suppose the upgraded A725 & Raith interchange help, but (as was said), the 2 lane sections of the M74 are often a huge bottleneck - it's noticeable how the road goes from busy to very quiet almost in an instant when you reach the 3 lane section after Happendon!

This was very interesting, great research as always, I have always wondered about an M7

I thought it was the M81?