Here's the Manitoba map:
http://umtig.eng.umanitoba.ca/Flow%20Map.htm
And the Winnipeg version:
https://www.winnipeg.ca/publicworks/...ficFlowMap.stm
There is a decent case to be made for making some stretches of the Perimeter (between Wilkes and CCW, between 59 and 7, and between Kenaston and St. Mary's) 6 lanes, along with 59 from 101 to either Birds Hill or Garven Road.
If you look at the Winnipeg map, it's clear that Lagimodiere could use some sort of improvement... it has Portage Ave-like traffic flows but without the extra lanes.
FWIW the thought of having a stretch of 6 lane highway is not really that unthinkable, we are a city of nearly a million people after all, and the highways tend to get busy.