10 code meanings
Harford County only uses two 10 codes for fire department. The code 10-50 refers to a motor vehicle collision and the suffix PI personal injury or PD property damage determines the type call. The second code is 10-99 which means crew requested or unattended unit or a company has been alerted for more calls then they have staffed medical units. That code is becoming less common because of many staffed ambulances. The only other MD county I know that uses 10-50 is Talbot county. Other then that most departments have switched to plan English.