activate
alarm
alert
background
box
brake
building
button
call
concept
danger
doorway
emergency
equipment
evacuation
exit
fire
guidance
handle
help
icon
industrial
information
protection
public
pull
push
railway
red
rescue
retro
safety
security
serious
sign
sos
station
subway
symbol
train
train station
transport
transportation
travel
urgency
urgent
wall
warning
way
white