California Highway Patrol Codes Flashcards

Study Notes

CHP Code Definitions

10-1: Indicates poor reception of communications.
10-2: Signifies good reception.
10-4: Acknowledges that the message has been received.
10-5: Instructions to relay a message.
10-6: Notifies that the unit is busy and requests a stand-by.
10-7: Denotes that the unit is out of service.
10-8: Indicates that the unit is in service.
10-9: Requests the transmission to be repeated.
10-10: Signifies that the officer is off duty.
10-11: Identifies mobile frequency, KA4993 ("S" Channel).
10-13: Requests an update on road or weather conditions.
10-14: To provide an escort for an individual or vehicle.
10-15: Represents a prisoner in custody.
10-17: Instructions to relay papers, supplies, etc.
10-19: Directs to return to a specified location.
10-20: Requests the location of an officer or unit.
10-21: Instructions to make a telephone call.
10-22: Asks to disregard the message or assignment.
10-23: Indicates a request for a stand-by situation.
10-28: Requests vehicle registration details.
10-29: Checks for wants on a person, vehicle, or object.
10-30: Indicates improper radio traffic.
10-31: Refers to a suicidal subject.
10-35: Urgent signal that an officer needs backup with a suspect present.
10-36: Alerts that confidential information is being conveyed.
10-36A: Indicates confidential info with a possibly armed subject.
10-36F: Relates to confidential info regarding possible felony wants.
10-36M: Confirms information about possible misdemeanor wants.
10-37: Asks for the current time.
10-39: Signifies that a message or item has been delivered.
10-97: Indicates arrival at the scene.
10-98: Marks completion of an assignment.

Additional Codes

11-10: Signifies to take a report.
11-24: Relates to an abandoned vehicle.
11-25: Denotes a traffic hazard, with specifics required.
11-26: Refers to a disabled vehicle that is occupied.
11-27: Indicates a driver's license check.
11-41: Requests an ambulance.
11-44: Indicates a fatality has occurred.
11-48: Requests to provide transportation for a person.
11-66: Refers to defective traffic signals that need description.
11-79: Indicates a traffic collision with an ambulance rolling.
11-80: Denotes a traffic collision with major injuries reported.
11-81: Signifies a traffic collision with minor injuries.
11-82: Refers to a traffic collision with no injuries.
11-83: Indicates a traffic collision with unknown injuries.
11-84: Directs to control traffic flow.
11-85: Requests a tow truck.
11-86: Indicates a bomb threat.
11-87: Specifies that a bomb has been found.
11-98: Arranges for a meeting at a specified location.
11-99: Urgently alerts that an officer requires help in an emergency.

Code Alerts

Code 2: Signals an urgent situation.
Code 3: Indicates an emergency situation requiring immediate response.
Code 4: Confirms that an emergency situation is stable and no longer exists.
Code 5: Indicates law enforcement surveillance.
Code 20: Requests to notify the press.
Code 33: Orders clear radio channels for emergency traffic.
Mayday: Signals for an emergency landing situation.