What does the code 10-3 signify?

The code 10-3 signifies "Stop Transmitting." In communication protocols, especially those used in radio and dispatch operations, this code is an imperative instruction directing users to cease their current transmission. It is important for maintaining clarity and avoiding interference, especially in busy communication environments where multiple users may be transmitting on the same frequency. By using code 10-3, operators can ensure that messages are conveyed without overlapping or confusion, thereby facilitating smoother and more efficient communication within the system.

Understanding the 10-codes, such as 10-3, is essential for personnel working within the Chicago Transit Authority, as these codes help streamline communications crucial for operational safety and coordination.