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

In Illinois, the maximum allowable speed limit in residential areas is 25 mph unless signs indicate otherwise. This speed limit is designated to enhance safety in neighborhoods where children may be playing, pedestrians are common, and there are more vehicles parked along the streets. The lower speed limit helps drivers react more quickly to unexpected situations that may arise, such as a child running into the street or a pedestrian crossing at an unmarked location. This regulation is in place to curb accidents and promote a safe environment for all road users. Speed limits in other contexts, such as on highways or rural areas, are typically higher, but in residential zones, the focus is on safety rather than speed.