What does a road sign with a yellow background usually indicate?

Answer: B — Caution or potential hazards

A road sign with a yellow background is designed to alert drivers to caution or potential hazards ahead. Yellow is a color that signifies warning and is used to indicate that there may be something that requires attention, such as curves in the road, pedestrian crossings, or construction zones. This prepares drivers to be vigilant and adjust their speed or driving behavior accordingly to ensure safety. In contrast, signs indicating mandatory actions typically use red or blue for enforcement, while information about upcoming exits is usually displayed with green signage. Speed limits are also communicated through specific regulatory signs rather than cautionary ones, underscoring the unique role yellow signs play in road safety messaging.