Where:
On any road, including highways, urban streets, and rural routes, especially in areas where police are temporarily controlling traffic due to a roadblock, accident, or emergency situation.

Purpose:
To warn drivers that there are temporary police-controlled conditions ahead, such as a temporary stop sign, collision scene, roadblock, or checkpoint.
The flashing blue lights signal that police officers are on duty and actively managing or directing traffic.
The sign alerts drivers to reduce speed, stay alert, and be prepared to follow police instructions or stop when required.

Action:
Immediately reduce speed and proceed with caution.
Be ready to stop at the temporary stop sign that usually follows the flashing blue lights, or stop when directed by a police officer.
Remain patient and follow all verbal and hand signals from police or traffic controllers.
Do not overtake other vehicles or attempt to drive around a police-controlled area.
Keep a safe distance from police vehicles, officers, and any emergency personnel or equipment at the scene.
Be alert for other road hazards, such as debris, damaged vehicles, or pedestrians near the area.