alarm
alert
ambulance
arrest
attention
background
beacon
bright
bulb
car
control
danger
dangerous
emergency
equipment
fire
flash
flasher
flashing
glass
glowing
industrial
isolated
lamp
law
light
medical
police
protection
red
rescue
rotating
safety
security
service
sign
signal
siren
speed
squad
symbol
traffic
truck
urgency
vehicle
violence
warn
warning
white