allow
amber
background
blue
car
city
cloud
color
concept
control
crossroad
danger
equipment
go
green
illuminated
intersection
isolated
lamp
light
lights
object
permission
ready
red
regulate
road
safety
semaphore
sequence
sign
signal
sky
space
stop
stoplight
street
symbol
traffic
trafficlight
transport
transportation
travel
urban
warning
way
white
yellow