What color and shape are service signs?

Service signs are designed to provide information about various facilities and services available to drivers, such as rest areas, gas stations, and food options. The correct description of service signs is that they are blue squares with white lettering. This color and shape are standardized to ensure that drivers can easily identify them while on the road, promoting safety and convenience.

The blue color is specifically used to convey that these signs are related to services, making them distinct from other types of informational signs. The white letters enhance visibility and readability, ensuring that drivers can quickly understand the information provided as they approach the sign.

This standardization helps maintain consistency across roadways, making it easier for drivers to interpret signs without confusion, which is crucial for safe navigation. Other color and shape combinations, while used for different types of signs, do not pertain to service information.