He had become a public figure, and in the years before his death, much of his poetry was written from this stance.
However, he is unable to deny his obligation to his family and his community; he cannot remain in the woods because of his "promises to keep," and so he continues on his way. You take the high road, I'll take the low road. Not only are they isolated but they represent loneliness, and thereby acquire symbolic status.
Most common speech is a combination of iambs and anapaests, so Frost chose his lines to reflect this: Two roads diverged in a yellow wood, And sorry I could not travel both This simple looking poem, mostly monosyllabic, has a traditional rhyme scheme of ABAAB which helps keep the lines tight, whilst the use of enjambment where one line runs into the next with no punctuation keeps the sense flowing.
As Frost argues in the poem, by focusing on "reality," the real actions of real people, a poet can sift through the unnecessary elements of fantasy and discover "Truth. Nature is not described for its own sake but as a thought provoking stimulus for the poet, leading him to more insight or revelation.
To be too subjective with what an artist has managed to make objective is to come on him presumptuously and render ungraceful what he in pain of his life had faith he had made graceful. His themes include the character, people and landscape of New England; fertility and beauty of nature; relationships between individuals and nature, and between individuals themselves; selfhood, love.
Then, the poet reaches a fork in the road. That strength takes many forms and the most obvious forms are not always the most significant.