In de scheepvaart (en luchtvaart) is het nog altijd links=rood, rechts=groen
Uit
Wikipedia"A unique feature on the apparatus of the CFD is the green emergency light that is typically found on the right front of the apparatus, in addition to the red light on the left front. This tradition dates back to the 1930s when Fire Commissioner Goodrich, whose family operated Goodrich Transit Company, adopted the port and starboard maritime light scheme for all apparatus and firehouses."