The interchanges are too close together in pretty much the entire northern half to raise the limit, from 60 St NE all the way around to pretty much Tuscany. In the southern half, there are two minimum radius curves for mainline that have to be a 100 kph limit; the curve through everyone's favourite interchange at Sarcee/Glenmore then the curve in the deep SE by Mahogany at the 22X/88 St interchange.
As for the gray area for enforcement in the SW, while that land was acquired from TTN by the province, it still isn't part of the City of Calgary. This is similar to Henday in Edmonton, where a big chunk on the eastern half actually lies in Strathcona County. I've seen EPS, RCMP, and Alberta Sheriffs doing enforcement in that case.
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