Originally Posted by DerbyDave
Could be a wheel bearing, I used to have a chevy that ate wheel bearings, when one failed it made a similar sound. You can check it by lifting the wheel and try to rock the wheel back and forth at 12 and 6 oclock. if it moves at all the bearing is bad.
Another way you can check is to weave the car back and forth, safely of course when no other traffic is around. When the weight transfers to the side with the bad bearing, the sounds gets louder, then quieter when the weight transfers away from it. That is if the bearing is a problem.