Phase 4 of the Kicking Horse Canyon, preliminary concept, included a tunnel as well as rock sheds/snow sheds on the western half. The cost thereto would have likely been closer to $650 million as opposed to the $400+ million in the final design.
Same 100 km/hr design speed except that the tunnel/rocksheds/snowsheds have been replaced by retaining walls as well as cantilevered highway/additional bridging. Brought down the cost. From BC MoTi:
Quote:
Tunnels were a consideration in earlier design concepts, however, further engineering during the preliminary design phase found more cost effective solutions that did not require them.
The alignment is designed to avoid the areas of avalanche hazard, and accommodate rock falls in catchment ditches, like those used on the east approach to the Park Bridge.
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