英文關鍵字
attention
background
blue
building
buildings
car
caution
city
clock
color
concept
control
crossing
crossroad
crosswalk
danger
downtown
drive
green
highway
icon
light
nobody
old
path
pedestrian
people
road
roof
rooftop
safety
sign
signal
sky
speed
stop
street
sun
symbol
top
town
traffic
transport
transportation
urban
walk
warm
warning
way
white
zebra