What shape are work area or construction signs typically?

Work area or construction signs are typically in the shape of a diamond or rectangular and are colored orange. The diamond shape is specifically designed to alert drivers to temporary changes in the road conditions, indicating the presence of work zones where caution is required. The orange color is universally recognized as a warning sign, signaling to drivers that they should be on the lookout for construction activities ahead.

This design effectively captures attention and conveys the need for enhanced vigilance, helping to ensure safety for both drivers and workers in the vicinity. The other shapes and colors mentioned in the other options do not correspond to the standard for construction-related signage, making the diamond or rectangular orange shape the correct choice for conveying warnings in work areas.