barrier
blue
carriage
carry
caution
closed
commuter
commuting
cross
crossing
crossroad
danger
electric
fast
fence
gate
intercity
level
light
line
long
motion
movement
moving
passing
rail
railroad
railway
safety
security
sign
signal
speed
street
track
traffic
train
transit
transport
transportation
travel
travelling
trip
unprotected
voyage
waiting
warning
way
white
yellow