What does the radio code 10-30 signify?

• A. Danger/caution
• B. Emergency
• C. Welfare check
• D. Code 1000

Answer: (A)

In police radio communication, numeric codes are used to convey information quickly. A 10-30 is a warning that a situation is dangerous or potentially hazardous, so responding units should proceed with extra caution, stay alert for changes, and be prepared to pause or back up if needed. It helps coordinate safety on scene without spelling out specifics, which is why it’s the best way to signal risk. This isn’t the same as an emergency requiring immediate, full-tilt response, which would use a different high-priority signal. Welfare checks and other codes don’t communicate the hazard warning that a 10-30 provides, so the danger/caution interpretation fits best.