What is the maximum speed limit in residential areas in Illinois unless otherwise posted?

Answer: B — 30 miles per hour

In Illinois, the maximum speed limit in residential areas is established at 25 miles per hour unless otherwise posted. This speed limit is designed to enhance the safety of pedestrians, children, and cyclists who are more likely to be present in residential neighborhoods. It reflects the need to slow down in areas where people may unexpectedly enter the roadway, making it easier to react to unforeseen circumstances. The importance of this regulation underscores the responsibility of drivers to be attentive and cautious in residential zones, where lower speeds help reduce the severity of potential accidents. Therefore, the stated answer indicating 30 miles per hour does not align with the regulatory standards set for residential speed limits in Illinois.