That's because you're unlikely to get hit by an F-150 while spacing out on the track.
Unless, of course, the prt isn't run on a track but on a coned/marked off road.
As for music, I like Yellowcard and the Killers, both have some pretty fast beats and catchy tunes.
	
 and ya'll running in tight full body spandex, some legwarmers, and a sweatband around your head.  For the love of God, please tell me ya'll aren't running the treadmills like this (atleast not in public!!!)  