If all drivers were polite, they would get where they're going faster

for me this is a no brainer but you be surpised at the number of belligrent drivers who think that their need to 'own' the road are justified in reaching their destination faster. Seriously does one car length help u get there even 5 minutes earlier?  http://www.umich.edu/news/index.html?Releases/2006/May06/r052306a