What color is typically used for a warning sign?

The correct answer is yellow, as this color is universally recognized for warning signs. Yellow is used to indicate caution and alert drivers to potential hazards or changes in road conditions ahead. This could include situations like curves, pedestrian crossings, or other areas where special attention is required while driving.

Red is commonly used for stop signs and regulatory signs, green typically indicates directional information or permitted maneuvers, and blue is often associated with information about services or facilities. Each color has its own specific purpose in the traffic sign system, contributing to a standardized way for drivers to interpret and respond to road conditions swiftly and safely.