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The question, “What’s your 10-20?” is actually a playful way of asking about someone’s current location. In the coded language developed by law enforcement and truckers, “10-20” means “location.” It’s similar to how civilians might say, “Where are you?” or “What’s your whereabouts?”
Ten-codes, also known as 10-codes or ten signals, are code words used by many police officers to aid with voice communication. The codes were originally developed in 1937 to allow for brevity, clarity, and standardization of messages transmitted over radio channels.
Police 10 codes are a common form of communication for LEOs. And while some departments are beginning to favor plain English over 10 codes, it’s still an important language to learn. Here is a fully comprehensive list of the Association of Public-Safety Communications Officials (APCO) 10 codes.
For the EEG electrode placement system, see 10–20 system (EEG). Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions.
Police 10 Codes are signals police officers, law enforcement officials, and government agencies use to talk in two-way radio communications. The codes are numbers that correspond to words, phrases, and messages frequently used in law enforcement work. Also, private citizens use certain code variations in Citizen’s Band (CB) radio transmissions.
10-codes were created to ensure clear and concise communication over the radio. They help officers quickly convey detailed information without lengthy explanations. For instance, “10-4” simply...
Police and emergency 10 codes. There are 4 sets of codes commonly used in the US, the general code is the most common. Other codes include the Association of Police Communications Offers (APCO), Norfolk, VA, and Walnut Creek, CA ten (10) codes.