This is the 2034th most frequent Polish word.
kolejnymi
"Subsequent" or "following."
Here, 'kolejnymi' is used as an adjective in the instrumental plural form, describing the streets that follow one after another.
Idziemy przed siebie kolejnymi ulicami.
We are moving forward through consecutive streets.
Here, 'kolejnymi' describes 'problems' in the instrumental plural, indicating they come after previous ones.
Spotkałem się z kolejnymi problemami podczas pracy.
I encountered subsequent problems during work.
In this sentence, 'kolejnymi' modifies 'steps' in the instrumental case, conveying progression or sequence.