Aerial roof markings

Aerial roof markings are symbols, letters or numbers on the roof of selected police vehicles, fire engines, ambulances, coast guard vehicles, cash in transit vans, buses and boats to enable aircraft and/or CCTV to identify them. These markings can be used to identify a specific vehicle, vehicle type or agency. The markings, depending on the vehicl...
Found on http://en.wikipedia.org/wiki/Aerial_roof_markings
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