Answer: To highlight that Mooreland is a small and quiet town
Explanation:
In the book/memoir by Haven Kimmel known as A Girl Named Zippy: Growing Up Small in Mooreland, Indiana, Haven, who was nicknamed Zippy by her father, describes, as the title suggests, growing up in Mooreland.
The town had a population of 300 and had only one main street on which there was a four-way stop sign, the only one in the town. This detail was put there to highlight how small and quiet the town was because bigger towns usually have multiple stop signs in order to control a heavier flow of traffic.
If Mooreland had only one of those, it most probably meant that they did not need more because their town was too small too need more.
