Special Weather Statement issued February 20 at 5:49PM EST by NWS Wakefield VA

As temperatures drop tonight into Friday morning, any lingering
moisture or slush on area roadways will freeze, which may result
in black ice formation. The threat for black ice will continue
into the mid morning hours on Friday before temperatures warm
above freezing. Motorists will need to be alert to the possibility
of slick spots. Motorists should exercise caution while driving,
especially on bridges and overpasses. Allow for extra time to
reach your destination and avoid sudden stops or accelerations.