alert
attention
background
black
caution
concept
conductor
control
cross
crossing
danger
direction
drive
forbidden
graphic
highway
icon
illustration
isolated
junction
law
metal
object
passenger
rail
railroad
railway
road
road sign
round
safety
sign
signal
speed
station
stop
switch
symbol
tracks
traffic
train
transport
transportation
travel
vehicle
warning
way
yellow
zone
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