What does a blue traffic sign indicate?

A blue traffic sign is specifically used to indicate services available for travelers, such as gas stations, food, lodging, and rest areas. This color coding is standardized to help drivers find necessary services easily while on the road, ensuring that they can plan their trips effectively.

In this context, the other options refer to different types of information conveyed by other colors of traffic signs. Regulatory information is typically indicated by red or white signs, caution or warning is communicated with yellow signs, and road construction is usually shown using orange signs. Recognizing the function of various sign colors is essential for safe navigation and compliance with traffic regulations.