英文關鍵字
animation
attention
barrier
black
caution
collection
construction
control
cross
danger
design
drive
electric
equipment
forbidden
freight
graphic
icon
illustration
intersection
isolated
junction
light
locomotive
motion
object
obstacle
protection
rail
railroad
railway
road
roadsign
safety
semaphore
sign
signal
simple
station
stop
symbol
track
traffic
train
transport
transportation
warning
way
white