"2. Ive never seen a motorway next to an A road. Dont think such a thing exists."
Does in my neck of the woods. There's a bit where the M8 and the A8 run side by side on the approach to the Shieldhall Roundabout (you can google it and see): it looks about 10-12 lanes wide, as far as I'm able to see when I look from the edge - like a football pitch-legth.
Happily, this A-road has a pavement about 12 feet wide, and I've only ever met one person walking there - I walked there loads before I cycled. I have cut along there on the bike a couple of times.
(If you want a laugh, look at the roundabout on satellite view; the small road, King's Inch Road there, has a cycle path: it used to end immediately after the roundabout, off a five-inch kerb, but they seem to have moved the sign - it now points you off a lowered kerb directly onto the give-way line instead.)