I agree with the above post, and I would add that the speaker of the poem speaks wistfully and with some regret that he will never know what might have been on the road of life he did not take. This is applicable to us all, as life is a series of choices with which we must live. How things might have been different--for better or worse--is something we all wonder.
The speaker of the poem is not very clear about how the less-travelled path affected his life...it almost seems like he regrets the choice he made. After all, a close reading of the poem will reveal that both paths were travelled about the same and one path was not any better than the other. I think that Frost is saying that we will all have to make crucial decisions in life, and we each have to make the decision that's right for us, regardless of what others do.
Life is to be considered one long journey. In that journey we should all enjoy every aspect of that journey that we can. If we all go the same direction, make the same choices and eat the same foods, our perceptions in life will all be similar. Each of us needs to try something different, something unexpected, to truly get out of life what is most rewarding. Taking the less travelled path is the answer. We each need to find our own way through life. There are times when we need the help of others, but the rewarding times are those that we can say that we ventured out on our own, not really sure what will happen, and persevered. In those moments, we learned more about ourselves and our surroundings than any moment when we travelled the worn path.
I wouldn't say the "less-travelled" path as if fewer people have gone that route. I would suggest the road that we had a chance to take but didn't. I would argue that we just can't take both, but it is still OK to wonder at what life would have been like if we had chosen the other.
Does anybody have a brief summary of "the real transformers" by Robin Marantz Henig?