In "The Road Not Taken" how does one path differ from the other and what is the symbolic meaning of the road?

In Robert Frost's poem "The Road Not Taken" the roads
which are mentioned are a metaphor for life.  More specifically, the paths are symbols
for the decisions we have to make in life.  The physical difference between these two
roads are that one was grassy and less traveled, whereas the other was more worn by
passers by.  The symbolism of the two roads is that the other path, the one that is not
taken, is representative of the easy road.  This of course is the path that most people
will take in life.  The other; however, the one the narrator chose was the more
difficult road.  At the end of the poem, the narrator comments that given the chance, he
would not have made the same decision again. He also admits that for better or worse,
this choice has made all the difference in his life.  It is also noteworthy to mention
that the title of the work is “The Road Not Taken” when the poem is clearly about the
road he did take.  This merely refers to the fact that we always
look back at the important decisions we make in life by thinking about the option we did
not take.