What do four-sided rectangular-shaped signs with a blue background provide?

Four-sided rectangular-shaped signs with a blue background are designed to provide information to drivers and pedestrians. These signs typically indicate services or facilities, such as rest areas, hospitals, or lodging, helping road users to find necessary services along their route. The blue background is specifically chosen because it signals a non-regulatory informational message, distinguishing it from other colors used for warnings or prohibitions. This guidance supports drivers in making informed decisions while navigating the road, ensuring their journey is safe and convenient.