arrest
authority
black
block
blue
car
city
cop
crime
department
emergency
enforcement
equipment
flasher
flashing
horizontal
illuminated
incident
land
law
light
lighting
lightning
night
no
objects
officer
order
patrol
police
polizia
raid
red
rescue
riot
road
scene
security
services
shadow
siren
speed
street
technology
theft
traffic
transportation
urban
urgency
vehicle