In reply to Phil1919:
I've done the Sustrans route from Glasgow to Inverness several times Phil - lovely route.
It's been a couple of years but if memory serves, you start by the Exhibition centre, and it feels like there's about 3-5 miles of 'city' cycling (off road but close to it) and then you seem to off on dedicated footpaths and then it seems to be off in the sticks in a remarkably quick time.
Very easy to follow, very well signposted
Gutted - we were supposed to be doing it in September last year, but had to cancel due to Covid uncertainty. Possibility for this year too but work commitments have put the blocker on it!