From the Main Handbook and High Command mandates. Example call: "[ER-111] is 10-76 to East Boat Shop."
Driving codes
Code 1Lights off · Sirens off
Not responding. Obey all traffic laws.
Code 2Lights on · Sirens off
Non-life-threatening call. Traffic laws still apply.
Code 3Lights on · Sirens on
Life-threatening call. You may break traffic laws.