With bridges going up, roads being worn and seeing broad highways, Still has set the stage for progress. These changes and the fact that the person keeps coming back show the significance of the home. They also reveal the speaker's deep intimacy with the land of his homeplace, his familiarity and comfort with it. By the end of the second stanza Still has already drawn on the sense of past for the readers. His goal now for the third stanza is to cry out to the reader not to forget home.
Home is warm and quiet and slow and peaceful.
Brought back again to this warm homing place. And so we experience the importance of the home, the traditional homeplace. Still has used change and progress to instill a sense of the past. He calls upon this past to instill a sense of feeling and mood in the reader. By doing this he can emphasize the significance of the home.