What is the primary purpose of white signs?

Answer: A — Regulates

The primary purpose of white signs is to convey regulatory information to drivers. These signs often indicate rules that must be followed, such as speed limits, parking regulations, and other traffic laws. The use of white as a background color helps to make these critical instructions clear and easily recognizable on the road. This function is essential for maintaining order and safety in traffic, as adhering to the regulations indicated by these signs is necessary for safe driving practices. In contrast, other colors serve different purposes. For example, yellow typically signifies warnings, guiding drivers to take caution ahead, while green is used to provide guidance on directions or distances. Blue often relates to informational signs such as services available. Each color and its associated signs play different roles in the overall traffic management system.