What does a blue sign usually indicate?

A blue sign typically indicates services provided to travelers, such as hospitals, rest areas, and other facilities that offer assistance. These signs are designed to guide drivers to essential services that may improve their travel experience and ensure safety. For instance, if a driver needs to find a place to rest, refuel, or seek medical assistance, the blue signs serve as a vital resource.

In contrast, signs that warn of hazardous conditions are often depicted in yellow or orange, not blue. Speed limits specifically in construction zones are communicated through distinct signage that also utilizes bright colors, typically yellow or orange, to alert drivers to lower speed limits. Restrictions, like no parking, are commonly marked with regulatory signs, which are typically white or red, designed to convey rules and regulations. Thus, while blue signs are associated with services, other colors and formats are used in road signs to convey different types of information.