Here's something more along the lines of what I think Mississauga-Brampton commuters would really benefit from the most:
As you can see, the Hurontario LRT line is underground through most of urbanized Mississauga (from Port Credit to Matheson), elevated crossing highway 403. North of there it then switches to at-grade, although it is also elevated (bridge) when crossing highways 401 and 407. North of Charolais it operates in a side-of-roadway operation through the Etobicoke Creek valley until north of Nanwood Station where it dips underground to enter the Downtown Brampton area.
Rather than following the official LRT plan that has a split service through downtown Mississauga (one branch staying on Hurontario, the other diverting to Duke Of York), I have the main line completely divert over to Duke of York, with stations at Burnhamthorpe/Kariya, DOY/ Princess Royal and Rathburn/Station Gate. This can be done because the Robert Speck/Hurontario area will be served via an extension of the Bloor-Danforth subway line. The Square One Station would be a mega terminal, with the subway station offering direct underground access to the mall on one end, meeting an underground Mississauga Transitway BRT station and the LRT station on the other.
This not only addresses how to deal with sections of Hurontario where the road cannot be expanded for ROW (Port Credit, Cooksville, downtown Brampton), but caters to the busiest section of Dundas through eastern Mississauga, giving passengers originating in the Dundas corridor a faster alternative to the 1 + 19 if going towards Square One or Toronto (bypassing Cooksville altogether). Per this plan, we could keep the Dundas corridor as BRT continuous from Kipling Stn all the way to Hamilton.