"The Road Not Taken" is a narrative poem which was written by Robert Frost at the beginning of the 20th century. It is a metaphoric poem which refers to "choices in life". The figure of speech used in this poem includes:
metaphor: all the poem is a metaphor which stands for options in life.
personification: it (the road) was grassy and wanted wear,
alliteration: Because it was grassy and wanted wear;
assonance: Two roads diverged in a yellow wood,