I went to a lot of the SE Stoney open houses, and that question come up over and over again. Simply put- the single biggest issue with Deerfoot is that there are too many interchanges too close together. It worked in a city of 500K, but not a million. So the engineers didn't want to repeat that mistake. Keep Stoney as free flowing as possible.
Looking at Google Maps it's 1.9 km from 61st to Peigan, and 2 km to Glenmore. That is closer than the 3 km they tried to keep between most of the interchanges.
What the City of Calgary could do is build collector roads beside, but I'm not sure if there would be enough traffic to justify the cost.
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