checkpoint
abstraction
agent
auto
automobile
blinker
car
cop
crime
criminal
criminality
delinquent
device
enforcement
felony
flash
flashing
law enforcement
light
lightning
malefactor
motorcar
officer
patrol
patroller
police
policeman
policemans
policing
polizia
racket
road block
roadblock
robbery
siren
sirens
theft
transport
vehicle