Example: Engine 5176, respond. or St. Helena, Engine 1375 responding.

The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code.

They have historically been widely used by law enforcement officers in North America, but due to the lack of standardization in 2006, the U.S.

This information would actually be transmitted in the text of the message as follows: John Brown 28-5-9-165 medium build brown eyes dark hair dark suit light hat Mich.35 lic.W 2605 Ford S 35 blue red wheels 2345678 may go to Indiana).

Credit for inventing the codes goes to Charles Charlie Hopper, communications director for the Illinois State Police, District 10 in Pesotum, Illinois.

Experienced radio operators knew the first syllable of a transmission was frequently not understood because of quirks in early electronics technology.

10 5 X 4 Answer Generator Called A

Radios in the 1930s were based on vacuum tubes powered by a small motor-generator called a dynamotor.

The dynamotor took from 110 to 14 of a second to spin up to full power.

Police officers were trained to push the microphone button, then pause briefly before speaking; however, sometimes they would forget to wait.

Preceding each code with ten- gave the radio transmitter time to reach full power.

An APCO Bulletin of January 1940 lists codes assigned as part of standardization; 7.

However, the ten-codes used by the NYPD are not the same as those used in the APCO system.

For example, in the NYPD system, Code 10-13 means Officer needs help, whereas in the APCO system Officer needs help is Code 1033.

The officer gives a 10-7 code (Out of service) and then a 10-42 code (ending tour of duty).

The study used standards for judgment of both communications procedures based on The Public Safety Communications Standard Operating Procedure Manual, 1970 edition, published by APCO.

Dispatch shall announce, Clear Code 1, when the condition is secured.

A Code 2 call has priority over all other police activities except emergencies.

Agents may, in exceptional cases, use their emergency equipment (both visual and audible to comply with state law) to traverse an otherwise clear intersection against a red traffic control device.

Once clear of the intersection - turn off the emergency equipment.

Proceed as quickly as possible with due regard for safety, and in compliance with the laws governing emergency vehicles.

The unit receiving a Code 5 will request the details when he is in a safe position to do so, which might not be until his backup arrives.

This will only be done if there are no injuries, no unusual circumstance and the vehicles are safely operable.

10 5 X 4 Answer Driver Exchange Forms

Driver Exchange Forms will be completed at the scene to include the C.

R. number.

The list of code words was republished in the 1990 Montana Mutual Aid and Common Frequencies document.

Example: Engine 5176, respond.