When there is an emergency every second counts. Quickly alerting other drivers to pull over and yield the right of way with attention grabbing police lights and sirens can shave precious minutes off of your response time.
Effectively capturing the attention of other drivers is also imperative when it's necessary to pull the driver over to interact with them or warn others of a hazard. The combination of police lights and sirens maximizes their effectiveness.
Different emergency vehicles may be outfitted with different police lights and sirens depending on the style of the vehicle and its function. Some of the more common police lights such as strobe lights, LED lights and light bars as well as sirens at prices so low it's almost criminal.