What colors are typically seen on a ROAD CLOSED sign?

The typical colors seen on a ROAD CLOSED sign are orange and white. This combination is specifically used in temporary traffic control, especially in work zones, to signify that a road is not traversable due to construction or maintenance activities.

The use of orange is significant since it conveys a warning to drivers about potential hazards ahead, which are characteristic of work zones. The white lettering or symbols on the orange background provides high visibility and contrasts well, making the message clear and easy to read.

Other color combinations serve different purposes; for example, red and white are often used for regulatory signs that indicate prohibitions or mandatory actions. Orange and black signs are commonly associated with construction warnings but are typically used for messages other than road closure. Blue and yellow typically indicate informational signs rather than warning or closure instructions. Hence, orange and white are the correct colors for a ROAD CLOSED sign within the context of work zones.