accident
attention
background
barrier
caution
construction
cordon
cross
crossing
danger
dangerous
equipment
europe
improvement
infrastructure
line
logistics
metal
metallic
outdoor
pedestrian
protection
railroad
rails
railtrack
railway
risk
road
safety
security
sign
sleeper
station
steel
stop
stripes
symbol
tape
tracks
traffic
train
transit
transport
transportation
travel
urban
walking
walkway
warning
yellow