This is the 3156th most frequent Polish word.
radiowozy
Police cars.
In this sentence, 'radiowozy' refers to the police cars as a group in a professional context.
Radiowozy policyjne zaparkowały przed budynkiem.
Police cars parked in front of the building.
The word 'radiowozy' here specifies the number and the action they are engaged in (driving with sirens on).
Widziałem dwa radiowozy jadące z włączonymi syrenami.
I saw two police cars driving with their sirens on.
'Radiowozy' in its singular form here is used in a demonstrative and educational setting.