They warn of temporary traffic conditions with a higher than normal potential hazard level. It is used as the background color in temporary traffic control signs and is most commonly seen in construction zones. It is not used as a legend color.
Communicating to busy and often distracted motorists before and within a work zone is crucial to keeping our communities moving safely. Signage is not only a required part of a standard work zone, its how we first connect to the traveling public and guide them safely through all types of changes and hazards along their route.