This poem, unambiguous on its surface, is actually a complex statement about human choices. First, the two roads are not as different as one would think: stanza two points at their similarities. It is oversimple to assume that one is “less traveled by,” despite line 15, since “the passing there /Had worn them about the same.” Both are laden with fresh leaves not yet “trodden black.” The main difference is that “the road not taken” had an obscured view after the first foreseeable section–this is the unknown element in his choice. The narrator is still on the "grassy" path as he reflects, because he will “sigh/Somewhere ages and ages hence.” He already realizes that he will never get back to that other path, so it will always be a source of mystery to him. So the attitude toward his choice is that he will always wonder what was beyond that bend in the undergrowth. While it is a temptation to interpret the poem as autobiographical allegory, a more sophisticated interpretation might be that Frost is articulating the doubts we all have about “what if?” and the unpleasant truth that “way leads unto way.” We are the sum of our choices. Cf. You Can't Go Home Again by Thomas Wolfe.