Ключевые слова: 911, accident, alert, alertness, arrest, auto, automobile, automotive, car, city, control, cop, crime, danger, drive, emergency, enforcement, flashing, guard, law, led, light, patrol, patrolling, police, police car, police siren, prevent, prevention, protection, red, road, safety, security, service, services, sign, signal, siren, street, surveillance, theft, town, traffic, transport, transportation, urban, vehicle, warning, watchful,