Normally, the province is really good an announcing lane closures and anticipated construction delays on the TransCanada Highway (Hwy 1) flowing to and from Victoria.
Not too sure what happened this weekend, but the unexpected and unannounced Saturday reduction to a single lane (east and westbound traffic) made for miserable travel on the second Saturday before Christmas.
The secondary arteries (eg, Helmcken) were more-or-less clear.
When we know of these events in advance, SPN will publish notice. In this case, it appears there were no warnings.