Warning signs are typically what color and shape?

Warning signs are typically yellow with a diamond shape. The yellow color serves to alert drivers to potential hazards on the road ahead, signaling that they should proceed with caution. The diamond shape is specifically designed to be recognizable and denote that the sign provides a warning about something that could affect driving safety, such as curves, intersections, or other potential dangers.

In contrast, the other options incorporate incorrect color combinations or shapes that do not align with standard traffic sign conventions. For instance, black and yellow are often used together but in different contexts, such as regulatory signs. White signs are primarily used for regulatory purposes, such as speed limits, while circular signs typically indicate railroad crossings rather than warnings. Thus, the combination of yellow and diamond shapes is the established standard for warning signs.