Ten-codes, also known as ten signals, are codes used to represent common phrases in voice communication, particularly by law enforcement and in Citizen's Band (CB) radio transmissions. These codes were first developed in 1937 and expanded in 1974, by the Association of Public-Safety Communications (APCO), and allowed for brevity and standardization of message traffic by radio.
While most of the codes are common among law enforcement, there are some differences between various departments and regions around the United States making standardization of the codes difficult and lead to the federal
government recommending they be discontinued in favor of everyday
language.
However the use of 10 Codes has continued and many agencies still use them commonly. The following list is the official list of code from APCO.
APCO 10-Code List
10-0
Caution
10-1
Unable to copy -- change location
10-2
Signal good
10-3
Stop transmitting
10-4
Acknowledgement (OK)
10-5
Relay
10-6
Busy -- stand by unless urgent
10-7
Out of service
10-8
In service
10-9
Repeat
10-10
Fight in progress
10-11
Dog case
10-12
Stand by (stop)
10-13
Weather -- road report
10-14
Prowler report
10-15
Civil disturbance
10-16
Domestic disturbance
10-17
Meet complainant
10-18
Quickly
10-19
Return to ...
10-20
Location
10-21
Call ... by telephone
10-22
Disregard
10-23
Arrived at scene
10-24
Assignment completed
10-25
Report in person (meet) ...
10-26
Detaining subject, expedite
10-27
Drivers license information
10-28
Vehicle registration information
10-29
Check for wanted
10-30
Unnecessary use of radio
10-31
Crime in progress
10-32
Man with gun
10-33
Emergency
10-34
Riot
10-35
Major crime alert
10-36
Correct time
10-37
(Investigate) suspicious vehicle
10-38
Stopping suspicious vehicle
10-39
Urgent -- use light, siren
10-40
Silent run -- no light, siren
10-41
Beginning tour of duty
10-42
Ending tour of duty
10-43
Information
10-44
Permission to leave ... for ...
10-45
Animal carcass at ...
10-46
Assist motorist
10-47
Emergency road repairs at ...
10-48
Traffic standard repair at ...
10-49
Traffic light out at ...
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10-50
Accident (fatal, personal injury, property damage)
10-51
Wrecker needed
10-52
Ambulance needed
10-53
Road blocked at ...
10-54
Livestock on highway
10-55
Suspected DUI
10-56
Intoxicated pedestrian
10-57
Hit and run (fatal, personal injury, property damage)
10-58
Direct traffic
10-59
Convoy or escort
10-60
Squad in vicinity
10-61
Isolate self for message
10-62
Reply to message
10-63
Prepare to make written copy
10-64
Message for local delivery
10-65
Net message assignment
10-66
Message cancellation
10-67
Clear for net message
10-68
Dispatch information
10-69
Message received
10-70
Fire
10-71
Advise nature of fire
10-72
Report progress on fire
10-73
Smoke report
10-74
Negative
10-75
In contact with ...
10-76
En route ...
10-77
ETA (estimated time of arrival)
10-78
Need assistance
10-79
Notify coroner
10-80
Chase in progress
10-81
Breathalyzer
10-82
Reserve lodging
10-83
Work school xing at ...
10-84
If meeting ... advise ETA
10-85
Delayed due to ...
10-86
Officer/operator on duty
10-87
Pick up/distribute checks
10-88
Present telephone number of ...
10-89
Bomb threat
10-90
Bank alarm at ...
10-91
Pick up prisoner/subject
10-92
Improperly parked vehicle
10-93
Blockade
10-94
Drag racing
10-95
Prisoner/subject in custody
10-96
Mental subject
10-97
Check (test) signal
10-98
Prison/jail break
10-99
Wanted/stolen indicated
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