Atlanta Police Department Signals Practice Test

In this signaling system, the number with a letter pinpoints the exact material involved in a gas or vapor release. Code 80D specifically corresponds to a diesel fuel leak. Diesel is a liquid fuel, and its vapors are flammable and can travel with the air and pool in low areas, creating both a fire risk and environmental hazards. That combination of fire and HazMat considerations is why the diesel designation fits this code. Chlorine would fall under toxic gas response with its own distinctions, gasoline leaks are designated differently, and HazMat is a broad tag for hazardous incidents but does not identify the specific substance involved. Recognizing that 80D means diesel helps responders quickly decide on the right protective gear, containment measures, and response actions.