Which term refers to the action of separating traffic from a collision scene?

The term that refers to the action of separating traffic from a collision scene is best represented by traffic control. This involves the use of various techniques and tools to ensure that emergency responders can safely access the scene without interference from oncoming or passing vehicles. Effective traffic control helps to maintain safety for both responders and civilians, prevents further accidents, and allows for a more organized and efficient response to the incident.

While options like "redirecting" and "setting barriers" may involve aspects of traffic manipulation, they do not encompass the full scope of what traffic control entails. "Fend off" is not typically a term used in this context, making it less relevant. Traffic control encompasses a comprehensive approach that includes alerting drivers, managing vehicular movements, and implementing safety measures to keep the collision site secure.