When players are timed in the 40 yard dash?

Question

Is it ran on a track or on grass or artificial turf, whatever the surface of the football field is? What do they wear when they run, are they in a football uniform or track clothes?

Answer 1

It depends.  The combine is on turf.  There is no set surface or circumstance.  If a player just holds a workout for NFL scouts, he can do the run wherever he wants.  That's why you can't believe the absolute accuracy of the 40 numbers you hear.

Answer 2

If its for high school/college its normally done on grass, and you were cleats/spikes, and in high school/college they normally make you were your equipment when you do this, if its the NFL you do it with no equipment, and you do it with turf shoes since Indianapolis has turf.  

Answer 3

grass or turf, because you dont play on a track