When would "fending off" be appropriately used?

"Fending off" is typically used in the context of protecting oneself or others from potential hazards or dangers in a specific situation. In the context of emergency response, particularly when attending an incident in lanes of traffic, this action is appropriate to ensure personnel safety and the management of oncoming vehicles.

When responding to incidents in active lanes, emergency responders face practical challenges such as navigating through traffic and being at risk of being struck by vehicles. "Fending off" can involve using tools or positioning oneself to alert oncoming drivers of the hazards ahead or to create a safer zone for the personnel attending to the incident. This proactive approach helps in maintaining safety for both the responders and the people involved in the incident.

In contrast, the other options do not present the same level of immediate risk from moving traffic or hazards where "fending off" would be necessary or applicable. Stopping in a safe zone, parking near a building, or being on the hard shoulder typically imply safer environments where traffic-related risks are minimized. Thus, the act of "fending off" is most relevant and critical in a scenario involving active lanes with potential dangers from other vehicles.