background
black
caution
cop
cross
crossing
danger
design
direction
drive
freight
graphic
grunge
hazard
icon
illustration
isolated
law
logotype
metal
object
off
pictogram
police
post
public
rail
railroad
railway
ride
risk
road
round
safety
shape
sign
signal
symbol
track
traffic
train
transit
transport
transportation
travel
warning
way
yard
yellow
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