11-55 Police Code Meaning & Definition

What Does 11-55 Mean?

11-55 is a police radio code most commonly used to mean Hazardous/Chemical spill.

Police departments and dispatch centers may use 11-55 differently, but Hazardous/Chemical spill is the most common meaning found in our database of agencies across the United States.

Most Common Meaning: Hazardous/Chemical spill

Used this way by: 50% of agencies on this page
Used in: 2 agencies across 2 states
Category: Emergency
Consensus: MediumMost agencies use this code similarly, but some regional or agency variations exist.

Code Distribution Breakdown

Hazardous/Chemical spill: 50% (1 agency)
Officer being followed by auto: 50% (1 agency)

11-55 Police Code Meanings by Agency

2 agencies across 2 states
11-55: Hazardous/Chemical spill
CategoryEmergency
State California
Agency San Diego Police Department
Sources
11-55: Officer being followed by auto
CategoryEmergency
State Illinois
Agency Chicago Police Department
Sources

Why Does 11-55 Have Different Meanings?

Police radio codes are not standardized nationwide. Different agencies may assign different meanings to 11-55 , which is why multiple definitions can exist for the same code.

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