英文關鍵字
background
black
changing
city
color
colour
control
danger
design
direction
driving
electric
electricity
equipment
forbidden
front
green
highway
illuminated
image
intersection
lamp
light
motivate
motivation
order
plight
red
regulate
road
safety
semaphore
sequence
shiny
showing
sign
signal
speed
stop
stoplight
street
symbol
traffic
transport
transportation
travel
urban
warning
yellow