accident
aid
airline
alert
attention
background
banner
beware
blue
care
caution
cloud
cockpit
concept
construction
copy
danger
dawn
drive
emergency
factory
first
health
help
industry
message
notice
person
protect
protection
risk
road
roadsign
safe
safety
secure
security
shape
sign
sky
space
symbol
tourism
traffic
transport
violet
warn
warning
workplace
yellow