英文關鍵字
background
black
car
changing
city
color
colour
control
danger
design
driving
electric
equipment
forbidden
front
green
highway
icon
illuminated
intersection
lamp
light
motivate
motivation
nobody
object
order
plight
red
regulate
road
safety
semaphore
shiny
sign
signal
speed
stop
stoplight
street
symbol
traffic
trafficlight
transport
transportation
urban
warning
yellow