This is the 5246th most frequent Turkish word.
kaldırımda
"On the sidewalk/pavement."
In this sentence, 'kaldırımda' locates the action 'oturan' on the sidewalk, emphasizing the place where the child is seated.
Kaldırımda oturan çocuk kitap okuyordu.
The child sitting on the sidewalk was reading a book.
Here, 'kaldırımda' describes where the action 'yürürken' (walking) is taking place.
Kaldırımda yürürken dikkatli olmalısın.
You must be careful while walking on the sidewalk.
In this usage, 'kaldırımda' indicates the location where the waiting action 'bekliyorlardı' is occurring.