Code 11 has no single meaning across police departments. Yuba City's communications training manual lists a normal traffic stop, while Cotati's manual lists an explosion. Alameda describes cover being far away, and Tucson identifies its Santa Cruz substation.
Code 11 Meaning by Agency
Each entry below comes from the agency document named in the source column. The differences are substantial enough that a one-line national definition would hide essential context.
| Agency or list | What Code 11 means | Source |
|---|---|---|
| Yuba City Police Department (CA) | Traffic Stop, Normal | Yuba City PD dispatch manual |
| Alameda Police Department (CA) | Cover is far away | Alameda PD dispatcher program |
| Tucson Police Department (AZ) | Santa Cruz Substation (South) | Tucson PD radio codes |
| Cotati Police Department (CA) | Explosion | Cotati PD communications manual |
Yuba City: Normal Traffic Stop
Yuba City's Communications Division Training Manual describes Code 11 as a normal traffic stop. In that context the label names the kind of unit activity. It does not, by itself, establish a citation, an arrest or what prompted the stop.
That definition is useful for a recording identified as Yuba City. It cannot be assigned to a different department merely because the radio phrase sounds the same. Compare the document period and agency before applying it.
Cotati: Explosion
Cotati's Communications and Records Training Manual uses Code 11 for an explosion. This is an incident-related definition, unlike Yuba City's traffic-stop entry. It is a clear example of two California agencies using the same number differently.
A search result that supplies one meaning without the city would therefore leave the reader unable to choose accurately. The California scanner guide explains how local response terms and incident labels are mixed in ordinary scanner searches.
Alameda: Cover Is Far Away
Alameda's Public Safety Dispatcher Training Program gives Code 11 a cover-distance meaning. That refers to assistance context rather than defining an offense or naming a routine stop.
Do not turn that short entry into a claim about a specific distance, response time or current threat. The published definition shown here does not supply those details. For other assistance language, see the officer-help guide and the Code 20 agency comparison.
Tucson: Santa Cruz Substation
Tucson's published radio-code page uses Code 11 for the Santa Cruz Substation in its south area. Here the code names a facility. The same number is not being used as a traffic-stop, explosion or cover-distance label.
Facility codes are a reminder that not every police number represents an emergency or offense. The full sentence and the agency can matter more than a familiar-looking numeric prefix.
Code 11 Is Not 10-11 or the Whole 11-Code System
A search for “police code 11” can mean several things. If the phrase includes the ten prefix, use the 10-11 page: it includes NYPD alarm-condition, Phoenix on-duty and San Antonio cover-request examples. If the code starts 11- and includes another number, use the 11-code guide.
For example, 11-99 is a specific emergency officer-assistance entry in the CHP card. It is not a definition of Code 11. The main code hub helps separate these forms before choosing a meaning.
FAQ
Does Code 11 mean a traffic stop?
Yes in the cited Yuba City training manual. The other agency documents in the table give different meanings.
Can Code 11 mean an explosion?
That is the entry in the cited Cotati manual. It is not a universal national meaning.
Is Code 11 the same as 10-11?
No. Retain the complete prefix and use the separate 10-11 comparison.
Is Code 11 shorthand for all 11 codes?
No. The 11-code family contains entries such as 11-44 and 11-99; Code 11 is a separate label.
How can I choose between these meanings?
Identify the agency, the document or recording date, and the surrounding words. If those are unknown, keep the interpretation uncertain.
Sources
- Communications Division Training Manual (radio codes, pp. 20-21), Yuba City Police Department. Updated November 2023. Official Checked October 2026
- Public Safety Dispatcher Training Program (radio codes, pp. 8-9), Alameda Police Department. Official Checked October 2026
- Tucson Police Department Radio Codes, Tucson Police Department. Official Checked October 2026
- Communications and Records Training Manual, Cotati Police Department. Official Checked October 2026