Useful radio codes to aid communications.
The 10-Code

10-0 Use Caution
10-01 Signal Weak
10-02 Signal Good
10-03 Stop Transmitting
10-04 OK, Affirmative
10-05 Relay to
10-06 Busy unless Urgent
10-07 Out of Service
10-08 In Service
10-09 Say Again (Repeat)
10-10 Negative
10-11 (Person) On Duty
10-12 Stand By (Stop)
10-13 Weather Conditions
10-14 Message/Information
10-15 Message Delivered
10-16 Reply to Message
10-17 En route to (location)
10-18 Urgent
10-19 (In) Contact
10-20 Location
10-21 Call (person) by Phone
10-22 Disregard
10-23 Arrived at Scene
10-24 Assignment Completed
10-25 Meet with (person)
10-26 E.T.A.
10-27 DL Check
10-28 Registration Check
10-29 NCIC Check
10-30 Danger/Caution
10-31 Pick up (person)
10-32 (#) Units Needed
10-33 Help me Quick!
10-34 Current Time
10-35 Interdiction
10-36 Security Check
10-37 Gang Activity
10-38 Computer Down
10-39 Urgent (lights and siren)
10-40 Silent Run (no lights)
10-41 Begin Tour of Duty
10-42 End Tour of Duty
10-43 Shuttle
10-44 Permission to Leave
10-45 Animal Carcass at
10-46 Assist Motorist
10-47 Investigate Vehicle
10-48 Disturbing the Peace
10-49 Traffic Light Out
10-50 Traffic Accident
10-51 Wrecker Needed
10-52 Ambulance Needed
10-53 Traffic Control
10-54 Change to Channel #
10-55 Intoxicated Driver
10-56 Intoxicated Pedestrian
10-57 Hit and Run (F, PI, PD)
10-58 Airplane Crash
10-59 Reckless Driver
10-60 Out of Car on Violator at (location)
10-61 VIN Inspection
10-62 Request Permission Car to Car
10-63 Prepare to Make Written Copy
10-64 Vandalism
10-65 Juvenile Problem
10-66 Major Crime Alert
10-67 Net Message
10-68 Runaway Juvenile
10-69 Missing Person
10-70 Fire Alarm
10-71 Nature of Fire
10-72 Fire Progress Report
10-73 Rape
10-74 Civil Disturbance
10-75 Domestic Problem
10-76 Meet Complainant
10-77 Return to (Location)
10-78 Back up (unit)
10-79 Notify Coroner
10-80 Chase in Progress
10-81 Breathalyzer
10-82 Prisoner in Custody
10-83 Confidential Information
10-84 Visitor Present
10-85 Victim(s) Condition
  A - Fair
  B - Poor
  C - Critical
  D - Possible Fatality
  E - Obvious Fatality
10-86 Crime in Progress
10-87 Abandoned Vehicle
10-88 Man with a Gun
10-89 Bomb Threat
10-90 Bank Alarm at (location)
10-91 Burglary
10-92 Theft
10-93 Unnecessary use of Radio
10-94 Contact your Home
10-95 Out at Home
10-96 Mental Subject
10-97 Test Signal
10-98 Prison Break