I wonder when that section of the I-5 was constructed, because it's not too different from Highway 1 east of Bridal Falls.
image:
http://i.imgur.com/M3xbyo6.jpg
link to similar section of bc1
Now considering when this section of highway 1 was built, the funding allocation/mechanisms may have allowed this type of construction, I don't know. It doesn't seem too far out too suggest that earthern barriers are outside the modern BC twinning budget.
Cariboo Connector? Yea sure. Places like kicking horse? definitely not.