What is the protocol for securing a fire vehicle at an incident scene?

The correct answer outlines the essential steps for ensuring the safety and stability of a fire vehicle at an incident scene. Setting the parking brake is crucial as it prevents the vehicle from rolling, especially on an incline or uneven surface. Placing chocks further enhances this security by creating physical barriers that stop the wheels from turning. Ensuring that the vehicle is in gear provides an additional layer of protection against movement, particularly when the vehicle is on a slope.

This protocol is vital for the safety of the crew and the public, as a moving vehicle can lead to serious accidents or injuries. Following these procedures consistently helps establish a safe working environment at the incident scene.