If I were to hazard a guess, I would be very certain that the Calf Robe bridges have spirals on the curves. They're probably just at minimum standards because of the situation there, and the need to reduce the amount of bridge they were building. The only place that definitely doesn't? NB Deerfoot at 17th Avenue. That's a compound curve and it always throws people off. A necessary evil to avoid the Bow River.
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