A SB weave on Deerfoot between 22X and Cranston Ave wouldn't fit, there isn't enough room unless you're bulldozing some houses in Cranston. A WB weave on 22X between Deerfoot and McKenzie/Cranston would fit, but involve 2 additional bridge structures. A EB weave between McKenzie/Cranston and Deerfoot would fit, but involve at least one additional bridge structure and compromise distances.
A secondary route for McKenzie/Cranston commuters is not the primary purpose of the ring road. When they considered the actual primary purpose of the road while doing their cost-effectiveness analysis, it was probably relatively easy to write-off the 30,000 people who chose to live in McKenzie/Cranston.
All that said, there's a reason they built the 52 St bridge to be 6 lanes over Stoney. Use it.
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