All cultures and professions have their own unique phrasings and jargon. Here's why police and truckers speak that way on the radio.

Virginia police are phasing out the use of radio codes, including 10-4 and other well-known phrases.

Have you ever heard someone, possibly a police officer, respond by saying “10-4?” What does that mean and where did it come from?

Another great American tradition, part of the lore and legend of the road, slid further toward oblivion last week. The Maryland State Police abandoned the terse “ten code” system of radio ...

Police 10-codes came about due to a need for brevity and comprehension on cluttered radio bands and were quickly adopted elsewhere.