Why is this mileage marker in British Columbia placed exactly 111km away, seemingly in the middle of nowhere?

While driving from Alberta to British Columbia, we noticed a road sign stating that Prince George was 111km away:

We wondered why this specific road sign had been placed at a specific mileage of 111km, seemingly in the middle of nowhere. There aren't any cities or stops nearby that would incentivize a road sign specifically here at the 111km point.

It's expected that there are some reminder road signs that tell you how far away the next major city is, but why here? Some highway planner would have drafted up a road sign to go specifically here for some reason, right? They wouldn't have paid to build and install a sign unless there was some reason to.

Is there perhaps a law that requires road signs in British Columbia to be placed after a certain number of kilometers? Is this just an equidistant spot between some points of interest? What motivates the placement of this type of road sign on a British Columbian highway?