| Code | Meaning |
|---|---|
| Code 1 | Emergency – Immediate response required, use lights and sirens. |
| Code 2 | Urgent but not life-threatening – No lights or sirens required. |
| Code 3 | Routine response – No urgency. |
| 10-4 | Acknowledgment (message received). |
| ETA | Estimated Time of Arrival. |
| BOLO | Be On the Lookout (used for identifying vehicles, individuals, or other persons of interest). |
| Request backup | Call for additional units. |
| Affirmative | Yes or confirmation. |
| Negative | No or denial. |