Questions & Answers about Na każdym rondzie patrzę na znak i dopiero potem skręcam.
Because na can take different cases depending on meaning.
- na + locative is used for location: na rondzie = at/on the roundabout
- na + accusative is often used for movement toward something: na rondo = onto the roundabout
In your sentence, the speaker is talking about what they do while at each roundabout, so Polish uses the locative:
- na każdym rondzie
not the accusative.
Każdym is the form of każdy that matches rondzie.
Here, rondo is:
- neuter
- singular
- in the locative case
So the adjective/pronoun must match it:
- nominative: każde rondo
- locative: na każdym rondzie
Polish adjectives and words like każdy change form to agree with the noun in gender, number, and case.