Question Black ice is: Answers Usually thick – about half an inch or more of ice. Usually thin. Not a hazard when driving. Not really ice. Explanation Black ice is a layer of ice that is thin and clear enough for the road to be visible through it. This makes the road look as if it is merely wet. Take a FREE Practice Test Now This questions appears in the following tests: Mississippi Knowledge Test Class A , Tennessee Knowledge Test Class B , Nebraska Tank , New Jersey Passenger ,