This poem symbolises that point in a person's life where they would have to make a major decision - a decision, that determines one's destiny. In this poem, Frost represents two choices before him as two roads. In one, he could see what would happen ahead - and the other, not so clear. Eventually, he decides to make that decision/path that people wouldn't normally take. Initially, he thinks that he could always revert to the other choice if the path he took doesn't satisfy him, and yet, 'knowing how ways leads on to way, [he] doubted if [he] should ever come back' - as time passed, and as things in life lead to another, he stuck to his path/decision. In the last paragraph, he reflects on that major decision-making with a 'sigh' - of contentment or satisfaction - that he had two choices, and he chose the less conventional one - this choice of his 'has made all the difference' - as it determined the shape of his life.