Special Weather Statement issued January 24 at 9:52PM EST by NWS Charleston SC

Temperatures tonight will drop to 20 to 25 degrees in most areas
by daybreak Saturday. The cold temperatures will freeze any
meltwater or slush on untreated surfaces tonight. Secondary roads,
sidewalks, or driveways in shaded areas along with untreated
bridges and overpasses will likely have a covering of ice and
packed snow through Saturday morning.

Black ice is difficult to see and distinguish from dry surfaces.
The deceptive nature of black ice can catch you unaware while you
are driving or walking, causing you to lose control of your motor
vehicle or to slip and fall.