Which sign color indicates caution in a work zone?

The color that indicates caution in a work zone is yellow. Yellow is universally recognized as a warning color, signaling drivers to slow down and prepare for potential hazards ahead. In the context of work zones, yellow signs are often used to indicate construction, maintenance, or other activities that may disrupt normal traffic patterns. This color draws attention and helps ensure that drivers are alert to changing conditions, such as workers or equipment on or near the roadway.

Blue typically conveys information regarding services and is less about caution, while green is used primarily for guide signs indicating directions or distances. White signs are generally informational or regulatory but do not convey the need for caution. Therefore, yellow is the correct choice when it comes to indicating caution in a work zone.