Which color is primarily used for roadway construction signs?

The primary color used for roadway construction signs is yellow. This color is specifically chosen because it is highly visible and draws attention, signaling caution to drivers. Yellow indicates that there are changes or hazards ahead, allowing motorists to prepare for potential detours, reduced speed limits, or other alterations in the normal driving conditions. It is crucial for ensuring safety in construction zones where workers and equipment may be present, and where the roadway conditions could change unexpectedly.

In contrast, red is typically used for stop signs and signals, green indicates guidance or information about directions, and white is used for regulatory signs. Each color serves a specific purpose in traffic management, helping to provide clear communication to drivers on the road.