Actually this is quite an interesting stretch of road because most of the reasons for the accidents have been due to the inattentiveness of the driver. Majority of the accidents and fatality have been head on collisions and going off-road. And this is mostly during daytime too...
They have increased the amount of concrete median barriers to avoid head-on-collisions but still haven't been able to solve the problem completely.
Speed surveys have been done pretty much every summer at this location and I believe the average speed is 100 km/hr (20 above the maximum). Also, wild animals also seem to be the cause of accidents yet there is only one sign throughout the 21 km.
Here's an old study:
Malahat Corridor Study Final Report