Final answer:
The OSHA two-in-two-out rule led to the development of the Rapid Intervention Team (RIT) to ensure firefighter safety during emergency operations.
Step-by-step explanation:
The concept that evolved from the OSHA two-in-two-out rule mandated by 29 CFR 1910.134 is the Rapid Intervention Team (RIT). The two-in-two-out rule is a safety procedure during firefighting operations that requires at least two firefighters to enter a hazardous area and remain in visual or voice contact with one another at all times, while two additional firefighters remain outside to assist in case of an emergency.
OSHA enforces safety regulations to prevent workplace injuries, illnesses, and fatalities, including the two-in-two-out rule. The creation of RITs is a direct response to this rule, providing a dedicated team ready to assist in case the fire response teams inside need immediate help.