英文關鍵字
asphalt
attention
automobile
brush
car
color
cone
crossing
danger
direction
drawing
hand
highway
industry
line
man
marking
markings
mechanization
old
outdoor
paint
painting
pavement
profession
protection
red
repair
road
roadway
safety
sidewalk
sign
speed
street
surface
symbol
tool
track
traffic
transport
transportation
travel
urban
used
white
worker