This is the 187th most frequent Polish word.
bezpieczeństwa
The Polish word "bezpieczeństwa" means "security" or "safety" in English.
'Bezpieczeństwa' functions here as a noun in the genitive case, describing the nature of the rules being aimed at safety.
Czuję się pewniej, kiedy zasady bezpieczeństwa są przestrzegane.
I feel safer when the safety rules are followed.
'Bezpieczeństwa' is used as a noun in the genitive case to specify the kind of systems—security systems—that are being tested.
Testujemy nowe systemy bezpieczeństwa w naszym budynku.
We are testing new safety systems in our building.
Here, 'bezpieczeństwa' is a noun in the genitive case, specifying the aspect being improved—namely, safety on the road.