Re, this ^^^^ cluster-[zb]…
M73 south has been split into 2 lanes after Gartcosh. Lane 1 for Baillieston/Coatbridge/A8, etc, Lane 2 for M73(s) to M74 only.
It’s a contraflow, and no doubt it’s going to be chaos/carnage… so, suggest sticking to outside lane after Mollinsburn to make sure you don’t get caught out and end up stuck in the lane to come off at Ballieston. Once you’re in the Baillieston lane, there’s no escape from it as far back as Gartcosh. 