Our photo editor's professional Googling abilities have led to us discovering a regularly updated map displaying construction occurring at UBC and associated road closures, along with the date ranges for the construction.
Most notably, the construction that's currently surrounding half of the SUB and adding several minutes to your commute -- utility work, apparently -- is ongoing until January 31.
Other highlights (or lowlights) include road closures near Ponderosa, detours in front of the Bookstore and closures of several service routes and side paths.
It looks like UBC updates this page regularly, with the most recent update having occurred January 8, so it's worthwhile to give it a glance anytime you're wondering about why you can't cross the road.