What does a blue rectangle sign typically indicate?

A blue rectangle sign is typically used to indicate services available ahead, such as gas, food, lodging, and other amenities. This type of signage is designed to inform and guide motorists to essential services, helping ensure a comfortable travel experience. In contrast, speed limits are represented by circular signs that are generally white with a black border; traffic instructions are conveyed through various shapes, but not specifically blue rectangles; and warnings of road hazards are indicated with yellow, diamond-shaped signs. Understanding the purpose of different colored signs and their shapes is crucial for safe navigation and informed driving.