starting signal
signal aspect
colour light signal
semaphore signal
traffic light
route indicator
signal post
signal indication
feather
signal bridge
lantern
headcode
green
advanced green
track lighting
danger signal
somersault signal
signal box
signal tower
red
track circuit
blinker
channel
tripcock
characteristic
transmission channel
signalman
flasher
banner repeater
stoplight
starter
dark territory
colouring
color
signal check
coloring
primary subtractive colour for light
primary subtractive color for light
colour
light show
radiotelegraphic signal
photoelectrocolorimetry
telegraphic signal
gate box
pilot light
visual signal
roller blind
sheen
optical telegraph
indicator lamp