What Does A Green Light On A Fire Truck Mean

Does anyone know what the multi colored lights on the side of the fire Chicagoareafire tanker lettered Lime green fire trucks « chicagoareafire.com

Fire Truck Lighting - HG2 Emergency Lighting

Hg2 variable visibility Fire truck lighting Anyone whatisthisthing

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lime green fire trucks « chicagoareafire.com

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Fire Truck Lighting - HG2 Emergency Lighting

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Does anyone know what the multi colored lights on the side of the fire