"The Road Not Taken" describes two paths that separate and move in different directions, forcing the speaker in the poem to make a decision regarding which path to follow.
The first stanza of the poem sets the scene, then describes how the speaker "stood and looked down one as far as I could." The first stanza becomes the representation of one of the two paths.
The second stanza presents the alternative, the second of the two pathways. It is described, contrasted with the first, and the speaker notes that it "wanted wear." The second stanza forms the picture of the second path.
In the third stanza, the speaker makes his/her decision and sets off down the pathway chosen; the fourth stanza predicts how the choice will be summarized in years to come. By dividing the poem into stanzas like the divided roads of the poem, Frost helps readers see the scene in their mind.