This is NF-4410, also known as Thompson Road. It's a forest road doubletrack, well maintained and serves as an access point to several of the singletracks in the Sun Mountain Lodge trail system.
The road runs from Patterson Lake road (intersecting at Chickadee Trailhead) and runs up and over Thompson Ridge.
This road is a good alternative for the long ascent to the top, accessing Magpie, Inside Passage, Pete's Dragon
, Meadowlark, and Bluejay.