英文關鍵字
accident
alarm
alert
ambulance
arrest
attention
background
beacon
blink
bright
bulb
car
danger
emergency
enforcement
equipment
fire
flash
flasher
flashlight
lamp
law
light
medical
orange
police
red
repair
rescue
road
roof
rotating
safety
security
service
sign
signal
siren
squad
symbol
technology
traffic
transportation
urgency
urgent
vehicle
warn
warning
yellow