From Longman Dictionary of Contemporary Englishblack iceˌblack ˈice noun [uncountable] DNan area of ice that is very difficult to see Driving conditions are dangerous, with black ice in many areas.
Examples from the Corpus
black ice• There may be black ice on the roads tonight, so drive carefully.• Thus will the terror of black ice be banished.• The previous year her chief secretary had travelled home on black ice and thick snow.• She looked like a drowned woman floating under black ice.• But the second ... I wanted to warn you: black ice, low cloud, a speed trap; some hazard. 