Final answer:
A sign with a yellow background is a warning sign, which alerts drivers to potential road conditions or hazards that may require caution.
Step-by-step explanation:
When interpreting road signage, the color of a sign can provide you with a lot of information about its purpose. A sign with a yellow background typically falls into the category of a warning sign. These signs are meant to alert drivers of specific road conditions or hazards that may require caution or a change in driving behavior. For example, there might be signs for animal crossings, changes in road layout, or areas with high pedestrian traffic. It's important to note that other colors have different meanings; for instance, a red background often signifies a STOP sign, which is a regulatory sign requiring drivers to come to a complete stop.