ahead
attention
banner
barrier
beware
black
car
careful
caution
color
control
cross
danger
dangerous
drive
engine
gate
illustration
isolated
level
metal
object
open
pole
railroad
railway
red
road
roadside
roadsign
safe
safety
sign
signage
signal
signpost
steam
street
symbol
technology
track
traffic
train
transport
triangle
warning
way
white
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