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'''Ten-codes''', properly known as ''ten signals'', are [[code word]]s used to represent common phrases in voice communication, particularly in radio transmissions. The codes, developed in [[1937]] and expanded in [[1974]] by the [[Association of Public Safety Communication Officials]], allow for brevity and standardization of message traffic. They are widely used by [[law enforcement]] officers in [[North America]]. Ten-codes were also adapted for use by [[CB radio]] enthusiasts before its pop culture explosion in the late [[1970s]], thus many of the phrases, such as 10-4 and "what's your twenty" have entered everyday use in the English language.
 
Some municipalities also use signal codes (e.g. "Code ten"), which typically gives further information the nature of a crime or emergency. These vary drastically from agency to agency.
The following is '''a sample of commonly used 10-codes, submitted for purposes of illustration. It is common for 10-codes to have numeric gaps between them.
 
'''
===List of 10-codes===
* 10-1 poor reception
The following list illustrates the current usage of various 10-codes. Only a handful of them are standardized. Some are fairly consistent, while others (such as 10-40) can have completely different meanings, many of which are not listed here. Multiple meanings for the same code are set apart by semicolons. Those definitions that have been adapted by most law enforcement agencies are set in bold. Meanings specific to CB radio are set in italics. ''This is not a complete list, but is intended to show some of the most common codes and help provide an estimate of what a code's definition is; a search for local ten-code tables should be performed first before using this chart.''
* 10-2 good reception
 
* 10-3 stop transmitting
* 10-0 '''use caution'''
* 10-4 message received, affirmative, ok
* 10-1 '''poor reception'''
* 10-5 relay this information to ___.
* 10-62 busy'''good reception'''
* 10-73 out'''stop of servicetransmitting'''
* 10-4 '''message received, affirmative, ok'''
* 10-8 in service
* 10-95 please'''relay repeatthis yourinformation messageto ___'''
* 10-106 negative'''busy'''
* 10-127 standby'''out of service'''
* 10-8 '''in service'''
* 10-13 civilians present and listening
* 10-9 '''please repeat your message'''
* 10-15 in route to station with suspect
* 10-10 '''out of service'''; negative; transmission completed; fight in progress; welfare check
* 10-18 urgent
* 10-11 talking too fast; enroute; animal check
* 10-19 return to station
* 10-12 '''visitors present'''; standby ; disregard; call in reports; at scene; check revocation
* 10-20 specify ___location/my ___location is ___.
* 10-13 '''advise weather/road conditions''', civilians present and listening; call-in resume
* 10-21 place a phone call to ___.
* 10-14 '''convoy or escort'''; suspicious person or prowler
* 10-22 disregard
* 10-15 '''prisoner/suspect in custody'''; domestic disturbance
* 10-23 stand by on this frequency (also "On scene" in some areas)
* 10-16 '''domestic disturbance'''; '''make pickup at ___'''
* 10-27 vehicle registration request
* 10-17 '''meet complainant'''; '''pick up papers at ___'''; ''urgent business''
* 10-28 arrests/warrents on driver's license
* 10-18 '''urgent'''; '''complete assignment ASAP'''; ''anything for us?''; drunk
* 10-29 arrests/ warrents on the vehicle
* 10-19 '''return to station'''
* 10-32 gun
* 10-20 '''specify ___location/my ___location is ___'''
* 10-33 emergency traffic follows, hold routine messages
* 10-21 '''please telephone ___'''
* 10-34 frequency open (cancels 10-33)
* 10-22 '''disregard'''; ''report to ___''; send blood technician
* 10-36 what is the correct time of day?
* 10-23 '''stand by on this frequency'''; '''arrived at ___location/on scene'''; status check; enroute to call; sex offense
* 10-39 false alarm, premises was occupied
* 10-24 '''assignment completed'''; trouble at station; unit not available; direct traffic
* 10-40 false alarm, no activity, premises appears secure
* 10-25 '''please contact person'''; do you have contact with person; come in for traffic; officer needs help
* 10-41 begin watch
* 10-26 ''' detaining suspect, expedite;'''; check auto registration; ETA; ''disregard last info''; phone residence
* 10-42 end watch
* 10-27 '''drivers license request'''; vehicle registration request; ''I am moving to channel ___''; any answer
* 10-45 fueling vehicle
* 10-28 '''vehicle registration request'''; driver's license request; ''identify your station''; missing person
* 10-49 en route to assignment
* 10-29 '''arrests/warrants request'''; ''time is up for contact''
* 10-50 accident
* 10-30 '''inappropriate use of radio'''; danger/caution; special check at ___; juvenile
* 10-51 tow truck needed
* 10-31 crime in progress; domestic disturbance; check for local warrants; suspicious person
* 10-52 ambulance needed
* 10-32 person with gun; fight in progress; ''radio check''; check NCIC; DWI test
* 10-53 road blocked at ___.
* 10-33 '''emergency traffic follows, hold routine messages'''; officer needs help; disturbance at ___; fire
* 10-54 animals on highway
* 10-34 frequency open (cancels 10-33); ''help needed''; riot; trouble at jail; correct time; meet officer
* 10-55 security check
* 10-35 '''confidential information'''; major crime alert; supicious person
* 10-57 [[hit and run (vehicular)|hit-and-run]] accident
* 10-5836 direct'''correct traffictime of day?'''
* 10-37 '''identify yourself'''; wrecker needed at ___; suspicious vehicle; shoplifter
* 10-59 escort
* 10-38 ''ambulance needed''; stopping suspicious vehicle; station report satisfactory; phone communications; vandalism
* 10-60 squad in vicinity, lock-out
* 10-39 '''your message was delivered'''; false alarm, premises were occupied; run with lights; contact officer; disturbance
* 10-61 personnel in area
* 10-40 false alarm, no activity, premises appears secure; ''please tune to channel ___''; expedite; run silent; advise if available; suspicious person; dead animal; mental patient; lunch
* 10-62 reply to message
* 10-41 '''begin duty'''; radio test; intoxicated person; debris in street; neighbor trouble
* 10-63 clear to copy info?
* 10-42 '''end duty'''; ''traffic accident at ___''; malicious mischief; request dispatch times
* 10-64 message for delivery
* 10-43 ''traffic jam at ___''; request criminal history; information; pick up passenger; armed robbery; rescue call
* 10-65 net message assignment
* 10-44 ''I have a message for you''; permission to leave; transmission received; rape; traffic accident (no injury)
* 10-66 net message cancellation
* 10-45 '''pick up officer'''; fueling vehicle; ''all units in range please report''; animal carcass; coffee break; traffic accident (injury)
* 10-67 person calling for help
* 10-46 motorist assist; lunch break; fuel break; wrecker
* 10-68 dispatch message
* 10-47 emergency road repair; call home; missing person; drunk driver; blood run
* 10-69 message received
* 10-48 traffic light repair; request criminal history; runaway juvenile; use caution
* 10-70 prowler, fire alarm
* 10-49 en route to assignment; traffic light out; bathroom break; any traffic; serving warrant
* 10-71 gun involved, advise nature of fire
* 10-50 '''accident'''; '''no messages'''; ''break channel''; auto accident with property damage
* 10-72 shooting, fire progress report
* 10-51 '''wrecker needed'''; auto accident with injuries; phone message
* 10-73 smoke report
* 10-52 '''ambulance needed'''; fatal auto accident; message for assignment; alarm
* 10-74 negative
* 10-7553 in'''road contactblocked'''; withsilent ___.alarm
* 10-54 '''animals on highway'''; silent pursuit; car stop
* 10-76 en route
* 10-55 '''intoxicated driver'''; security check; ambulance call
* 10-77 [[estimated time of arrival|ETA]] ___.
* 10-56 '''intoxicated pedestrian'''; warrant indicated; arrived at scene
* 10-78 need assistance
* 10-57 '''[[hit and run (vehicular)|hit-and-run]] accident'''; narcotics; officer at pistol range
* 10-79 bomb threat, coroner's case
* 10-58 '''direct traffic'''; wrecker; DOA; teleprinter message
* 10-80 bomb has exploded
* 10-59 '''escort'''; out of car checking violation; ambulance; bomb threat
* 10-81 [[breathalyzer]] report
* 10-60 '''traffic stop'''; '''squad in vicinity''', lock-out; what is next message number?; coffee break; assist motorist
* 10-82 reserve lodging
* 10-61 '''personnel in area'''; stand by for CW traffic; clear of traffic stop; weather conditions?; lunch break
* 10-83 work school crossing at ___.
* 10-62 reply to message; ''unable to copy, use phone''; check for rising water; logged on/off
* 10-84 if meeting ___, advise ETA
* 10-8563 delayclear dueto copy info?; net directed to ___.; need barricades
* 10-64 message for delivery; net clear, resume normal traffic; field investigator
* 10-86 officer on-duty
* 10-65 '''net message assignment'''; kidnapping
* 10-87 pickup
* 10-66 net message cancellation; bathroom break
* 10-88 present phone number of ___.
* 10-67 prepare to copy; person calling for help; ''all units comply''
* 10-89 bomb threat
* 10-68 dispatch message; repeat dispatch; switch channels
* 10-90 bank alarm at ___.
* 10-69 message received; any calls holding for me?; sniper
* 10-91 pick up prisoner
* 10-70 prowler, fire alarm; ''fire''; fire followup; net message; chemical spill
* 10-92 improperly parked vehicle
* 10-71 gun involved; advise nature of fire; proceed with transmission; officer needs assistance; fire inspector
* 10-93 blockage
* 10-72 shooting; fire progress report; check safety of officer; follow-up rescue; radar assignment; street blocked
* 10-94 [[drag racing]]
* 10-73 '''advise current status'''; smoke report; ''speed trap at ___''; notify coroner; arson investigation
* 10-95 prisoner/subject in custody
* 10-74 '''negative'''; tactical plan
* 10-96 psych patient
* 10-75 in contact with ___; ''you are causing interference''; drunk driver; miscellaneous out code
* 10-97 check signal ("On Scene" in CA and other areas)
* 10-76 '''en route'''; traffic accident; send SWAT team
* 10-98 prison/jail break
* 10-77 '''[[estimated time of arrival|ETA]] ___'''; ''negative contact''; accident with injury
* 10-99 wanted/stolen record
* 10-78 '''need assistance'''; major accident with injury; request wrecker
* 10-100 dead body
* 10-79 notify coroner; bomb threat; hit & run
* 10-200 alarm'''==See also==
* 10-80 bomb has exploded; pursuit in progress; tower lights out; on assignment; demonstration
* 10-81 '''[[breathalyzer]] request'''; stop for interrogation; reserve hotel room; officer ___ will be at your station; at vehicle maintenance; civil disturbance/riot
* 10-82 reserve lodging; stop for interrogation/arrest; traffic signal out; cover assistance
* 10-83 work/school crossing at ___; call station; units stop transmitting; at radio shop; officer in trouble
* 10-84 '''if meeting ___, advise ETA'''; checking officer status; ''my telephone number is ___''; follow-up; broken utility main
* 10-85 '''delay due to ___'''; prepare to copy info; ''my address is ___''; loose livestock
* 10-86 '''officer on-duty'''; utility line down
* 10-87 '''pickup or prisoner transfer'''; dead body
* 10-88 telephone number of ___; station call; special assignment; true alarm
* 10-89 '''bomb threat'''; send radio repair; officer at academy
* 10-90 '''alarm'''; radio repair to be at station; officer at headquarters; false alarm
* 10-91 '''pick up prisoner'''; ''talk closer to the mike__''; prepare your inspection; vehicle fuel
* 10-92 '''parking violation'''; ''your signal is weak''; officer at court
* 10-93 '''blockage'''; ''please check my frequency''
* 10-94 '''[[drag racing]]'''; ''give me a long count''
* 10-95 '''prisoner/suspect in custody'''; ''transmit dead carrier for 5 seconds''
* 10-96 '''psych patient'''
* 10-97 '''arriving at scene'''; test signal; possible wanted person in vehicle; known offender; officer at court
* 10-98 '''criminal history indicated'''; prison/jail break; officer at juvenile court
* 10-99 '''warrants/stolen indicated'''; '''officer needs assistance/held hostage'''; ''mission complete''; bathroom break
* 10-100 '''bathroom break'''; dead body
* 10-200 ''police needed''
 
==See also==
* [[Q code]]
* [[voice procedure]]