Though the distance is the same, the differences between a road and track mile can be more than the surface under your feet. Check out the following video on Runnerspace from their Tuesday Tips series to get the scoop straight from Queen of the Road Mile, Heather Kampf.
Road Miles are pretty awesome. I’ve only really gotten to run them as a masters guy, and the timing needed to move at the right time is so funky when you don’t have that measured track under your feet!