What is the primary purpose of using warning devices at a crash scene?

The primary purpose of using warning devices at a crash scene is to alert approaching traffic. When vehicles are involved in a crash, it's crucial to ensure that oncoming drivers are aware of the potential hazards ahead. Warning devices such as flares, cones, or reflective triangles serve to convey important safety information. By alerting drivers, these devices help prevent additional accidents and can guide traffic safely around the scene. This proactive approach not only protects those involved in the crash but also helps maintain the flow of traffic and reduces the risk of further incidents.