I would not say I compete with people but I certainly use the as "carrots" to encourage me to push harder. I also tend to watch traffic, especially jerks that drive as such, to see if their evasive driving really mattered and I found that for the most part I tend to catch them at the next light a bunch of the time. There is one spot on the commute home where I have more drama with cars than I would like and we all get stuck at the same light a 1/4 mile away. They act as if I am destroying their day only to find that I catch them at the next light. I enjoy "racing" them just to rub it in their faces.