英文關鍵字
amber
background
blue
car
change
city
color
colorful
concept
control
cross
crossing
danger
drive
empty
environment
green
information
junction
light
lights
object
pedestrian
protection
ready
red
road
safe
safety
semaphore
set
sign
signal
sky
space
stop
street
town
traffic
trafficlight
transportation
travel
urban
warning
way
yellow