What idea is emphasized through repetition?

Answer:
The streets are unusually crowded.
Explanation:
From the text we understand that the traffic is unusually heavy and that there had never been so many people driving in the quiet neighbourhood.
Answer:
The streets are unusually crowded
Explanation:
In line 2 it says "Mother Lois maneuvered through the unsually heavy traffic."
And then again in line 3 it says "'I don't know how where all the cars could have come from,'"
Both of these lines mention that the street is very crowded.