I'll say one thing, it's easy to see why this portion is the most expensive, by far.
5 systems interchanges ( 4.5 I suppose, since one is half built) - no more than 1.5 on any other leg. That doesn't include Anderson Road interchange which is significantly more than just a plain interchange.
Twinning the bow river bridge - no other leg had a bridge like it, as the original wasn't part as part of much of a leg.
Massive amounts of earthwork to get up the hill south of 16th ave, and perhaps back down to Glenmore.
Around 50% longer than any other leg.
I suspect that the Elbow River bridge will be taller and wider than it might have been had it been built before last year. Same with the Fish Creek bridge.
Leaving room for future express lanes means that interchange bridges need to be significantly longer than otherwise - more spans.
Dealing with existing high traffic areas where traffic will need to to have temporary alignments - Glenmore, Sarcee, 37th Street, north and south of the a Elbow, 22x, McLeod Trail. No other leg has had even close to that amount of accommodation of existing traffic. That doesn't even mention the existing 16th Ave/ Stoney interchange, which is getting a major makeover, but was designed so that building the full interchange can be done without too much traffic disruption.
On the city's side, it could bring up the need for a Richmond Road/ Sarcee interchange, and perhaps a Bow Trail/ Sarcee interchange. Glenmore/Crowchild will almost certainly need a new EB to NB ramp of some kind. Glenmore will likely have to be widened between 37th and Crowchild (37th to Sarcee already included in the provinces portion. Also, this section of Glenmore is getting widened this year I think, so it'll be done by then)
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