When called to an accident scene with functioning traffic lights, what should an officer do?

When called to an accident scene with functioning traffic lights, making the lights flash red is the best course of action. This action effectively alerts drivers to the fact that there is a situation requiring attention and potentially slowing traffic in the affected area, thereby enhancing safety for all involved, including the officers and emergency responders at the scene.

Activating the lights to flash red serves as a clear signal that drivers must stop or proceed with caution, which is crucial at an accident scene where visibility may be impaired or where hazards exist. It also helps in controlling the flow of traffic, leading to a more organized handling of the situation.

Redirecting traffic manually or using flares may not provide the same level of clarity and could potentially create confusion, especially in an environment where drivers are accustomed to following traffic signals. Notifying dispatch of traffic conditions can be important for broader situational awareness, but it does not directly address the immediate need to control traffic at the accident scene. Thus, managing the traffic lights to flash red is the most effective measure to ensure safety and order.