Stampsx2, you do realize that the ring road has to go west from the intersection of Glenmore/37th. The ROW south of Glamorgan is just as narrow as the one beside lakeview. You have to be able to make the corner at a reasonable speed, but in order to do that houses would have to be taken out in both Lakeview and Glamorgan. The total length of cut and cover would be ~5km, about 8 times as long as the airport Trail tunnel. Unlike the airport Trail tunnel, all of it would be in a narrow right of way, or in an environmental area. Either one of those makes the excavation and hauling much more complicated. Sure, the tunnel walls and roof would not need to be so beefy, but you would certainly have more complicated forming, horizontal and vertical curves, exit ramps, perhaps whole underground interchanges.
Frankly, whomever made up that presentation had no idea what they were talking about. It looks like a citizens group made it, not the government, or anyone else that would actually have a clue about the costs.
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