Final answer:
Restricted Areas are special use airspaces designated for hazardous activities like testing of large rocket motors and blasting, providing safety for both those operations and nonparticipating aircraft.
Step-by-step explanation:
The special use airspace you're referring to is designed to contain activities that would pose a hazard to nonparticipating aircraft. Such airspaces are Restricted Areas.
Restricted Areas are a type of special use airspace where unusual, often dangerous, activities are conducted, such as rocket motor testing and blasting. When these operations are active, the airspace is not accessible to general aviation without permission. The restriction acts as a safeguard for both the activities being conducted and nonparticipating aircraft.