a turkey vulture's wind tunnel

I was out on a morning bike ride to Clinton Lake. At the far west end before the boat ramps is a nice gradual descent between the trees. A turkey vulture came in over my head about 15 ft up and soared above me for quite a ways keeping pace just ahead of me (half-wheeling me?). Staying just below the tree tops, the road must be sort of a wind tunnel where this bird was catching a good draft.