What is the speed limit in alleys unless otherwise indicated?

Answer: D — 10 mph

In Minnesota, the designated speed limit in alleys is 10 miles per hour unless signage indicates otherwise. This lower speed limit is intended to enhance safety in these typically narrow and heavily trafficked areas, where pedestrians, cyclists, and parked vehicles are more common. Reducing the speed allows drivers to react quickly to unexpected situations, such as children playing or vehicles suddenly exiting driveways. The other options represent higher speed limits that apply to different types of roads and conditions, which do not align with the safety considerations relevant to alleys. Therefore, understanding and adhering to the 10 mph limit in alleys helps to create a safer environment for all road users.