West Saanich Rd is already marked with cycleway=lane along its entire length in both directions. From the wiki, this value appears correct.

An alternative would be cycleway=shoulder, but that value is intended for roads whose hard shoulders are incidentally good enough for cycle use in the absence of explicit infrastructure. That's not the case here, the shoulders are explicitly designated for cyclist use in addition to their original emergency role.

Based on this, OSM's data seems to correctly reflect the bike infrastructure on this road.