aland wrote:quetion is are you going to be able to access the M73 from the neew M74 and go north towards ballieston and pick up the M8 and vice versa, if yes then it will avoid a hell of a lot of traffic from townhead towards the kingston bridge
That's always been possible and isn't going to change once the M74 extension is built - the M74 has been built west of the Maryville interchange with the M73 for many years now (the section from Maryville to Fullarton was completed in 1995 according to this link http://www.sabre-roads.org.uk/wiki/index.php?title=M74_and_A74(M)_History#Phase_3_.281987_to_2011.29).
I used that route when commuting to Edinburgh from King's Park years ago: far quicker to head out to Fullarton via Rutherglen, than join the M8 at the Kingston Bridge.