The eleven-code is a system of numeric code words devised by the California Highway Patrol to describe dispatches or situations unique or frequent to the work of the CHP. The California Highway Patrol (CHP is a state agency that acts as the State police force of California. It is also used alongside the ten-code and other voice radio protocols. Ten-codes, properly known as ten signals, are Code words used to represent common phrases in voice communication particularly by law enforcement and in Citizen's Other agencies also use it or an adapted version.
| Code | Meaning |
|---|---|
| 11-10 | Take report |
| 11-24 | Abandoned vehicle |
| 11-25 | Road/traffic hazard |
| 11-26 | Inoperable vehicle |
| 11-41 | Send ambulance |
| 11-42 | Send paramedics |
| 11-44 | Possible fatality |
| 11-48 | Provide transport |
| 11-66 | Defective traffic light |
| 11-79 | Collision has occurred; ambulance en route |
| 11-80 | Collision w/ major injury |
| 11-81 | Collision w/ minor injury |
| 11-82 | Collision w/ property damage only |
| 11-84 | Manual traffic control needed |
| 11-85 | Tow truck needed |
| 11-86 | Bomb threat |
| 11-87 | Bomb found |
| 11-98 | Meet |
| 11-99 | Under attack, immediate assistance required |