What does the "roads" symbolize in the third line?

Reading Comprehension: Read the quoted parts carefully and answer the questions in English. Write your answers in the corresponding space.I shall be telling this with a sigh Somewhere ages and ages hence: Two roads diverged in a wood, and I — I took the one less traveled by, And that has made all the difference. 
What does the "roads" symbolize in the third line?
【正确答案】：

CHOICES IN LIFE

【题目解析】：第三行的“road”象征着生活中的选择。