During which situation should warning devices be placed on approach to a collision?

Placing warning devices on approach to a collision is crucial for safety, and this action should be taken when the scene is safe to do so. This ensures that the warning devices, such as flares or cones, are utilized effectively without jeopardizing the safety of the responder or other motorists. Assessing the safety of the environment helps prevent further accidents and allows for a controlled response to the incident.

In situations where warning devices are not set up safely, responding personnel could be at risk from oncoming traffic or other hazards. Therefore, ensuring that the area is secure first is a necessary step. Other contexts, such as the arrival of police, yielding of vehicles, or heavy traffic conditions, do not inherently guarantee the safety needed to deploy warnings effectively. Thus, the primary focus should be on ensuring the scene is safe before utilizing any warning devices.