According to the MUTCD, temporary traffic control signs should be what color?

Temporary traffic control signs are primarily used to convey warning information and alert drivers to changes in roadway conditions. The Manual on Uniform Traffic Control Devices (MUTCD) specifies that the appropriate color for temporary traffic control signs is orange. This color is universally recognized as a cautionary signal relating to construction or maintenance zones.

By utilizing orange signs, the intention is to grab the attention of drivers and inform them about potential hazards or changes in traffic patterns that may affect their driving. This immediate recognition of the color orange in conjunction with temporary signs enhances safety by ensuring that drivers are aware of and can respond appropriately to sections of roadway that may require reduced speeds or increased caution.

The other colors listed serve different purposes within the MUTCD framework. For instance, red typically signifies stop or prohibited actions, blue is used for informational signs related to motorist services, and yellow-green is designated for pedestrian and bicycle warning signs, which are not reflective of the temporary traffic control context.