https://mapsengine.google.com/map/edit?mid=zJh1JiVkvThc.kIJgRS-h0P7A
Red, future highway
Yellow, future bridges
Dark Green, Confederation LRT
Light Green, O-Train
Light Blue, Rapidbus
Black, Dedicated Transitways
Blue, future LRT
Orange, Commuter rail, existing line(possibly removed and a trail now)
Brown, future rail
Basically I started with what exists. And then I extrapolated from there.
Highways:
416 gets extended to the Prince of Wales Bridge, which gets replaced by a bridge that would carry 6+lanes of freeway and 2 rail tracks.
The A-50 would get extended to the bridge.
A-450, would create a Ring Road north of Gatineau. It would connect to a bridge that would cross east of Aylmer. It would turn into 429.
429 would go east and south of Ottawa to Cumberland, creating the other part of the Ring Road. It would go near the edge of the Greenbelt.
174 would be 4 laned to 429
431 would replace the Airport Parkway, and then connect to Bank St to the end of A-5 The part north of The Queensway would be tunneled.
LRT/O-Train
All transitways would be turned into LRT.
O-Train would cross over the Prince of Wales Bridge to connect to Rapidbus, that would be converted to rail.
The LRT would extend to the Airport. It would also extend out to the Canadian Tire Centre. There would be an extension to Gloucester.
In Gatineau, it would extend to Aylmer.
Commuter Rail:
One line would go to Renfrew and Armprior.
Another would go to Smith Falls. This line could have 2 branches, one to Perth, one to Carleton Place.
A new line would need to be built to cover Orleans towards Hawkesbury.
Another new line would connect Cornwall to the line at Cassellman.
As far is in Quebec, there appears to be no active lines east of Gatineau. It has all be converted to a trail. It would have to end up being rebuilt.
West of Gatineau, a line to Thurso.
It is very ambitious, but, if built, it could keep up with expansion, and not be dogged by extreme congestion.