What does Code 10-4 mean?

The meaning of Code 10-4 is widely recognized as "Radio traffic acknowledged." This code is part of a series of ten-codes used in radio communications to convey information quickly and clearly. When someone uses Code 10-4, they are confirming that they have received and understood the message being sent. This concise communication helps to maintain efficiency, especially in high-pressure situations, by allowing operators to acknowledge messages without needing to go into lengthy explanations.

In contrast, the other options represent different meanings: "Wait for further instructions" denotes a lack of clarity and the need for additional guidance, "Urgent message" indicates that something pressing needs to be communicated immediately, and "Unauthorized communication" suggests a breach of protocol or rules, none of which capture the essence of what Code 10-4 actually signifies.