Perhaps the stretch of Glen Osmond road between Fullarton and Greenhill Roads could be made single lane in either direction, with a lane given over to parking bays on each side.
Then, the majority of traffic would have to be diverted via Fullarton and Greenhill Roads.
The intersection of Greenhill ...

I have been a regular user of Glen Osmond Road for the past 15 years, work in Mount Osmond, and now live in a house on Glen Osmond Road.

Fortunately, I have mostly avoided the peak hour rush as I head out of the city in the morning, then back down in the evening. So my experience is with the ...