What is the speed limit in a residential area unless posted otherwise?

Answer: B — 25 mph

In Arizona, the default speed limit in residential areas is set at 25 mph unless otherwise posted. This speed limit is designed to help ensure the safety of residents, particularly children and pets, who may be present in these neighborhoods. By maintaining a lower speed, drivers have more time to react to sudden obstacles, such as pedestrians or parked cars that might unexpectedly pull out into traffic. This limit also encourages a more relaxed driving environment, which is crucial in areas with higher foot traffic. While there may be specific signs that indicate different speed limits in certain residential areas, the 25 mph limit serves as a standard guideline that applies broadly across most neighborhoods in Arizona. Understanding this default speed limit is essential for safe driving and compliance with local traffic laws.