This is the 6224th most frequent Russian word.
тротуаров
Sidewalks.
The word 'тротуаров' here is used in the genitive plural form, referring to sidewalks as objects of the action of repair.
В городе недавно завершили ремонт всех тротуаров.
In the city, they recently finished repairing all the sidewalks.
In this sentence, 'тротуаров' is again in the genitive plural form, denoting sidewalks as the subject of discussion.
Пешеходы активно обсуждали состояние тротуаров в центре.
Pedestrians actively discussed the condition of the sidewalks in the center.
Here, 'тротуаров' is used in the genitive plural form to specify the edges of sidewalks as locations of prohibition.