2011 RAV4 makes humming noise while driving, not when idling. It does not seem to be connected to the accelerator. If I shift into neutral while cruising it still makes the humming sound but will decrease as the speed decreases. It is not a high pitched whining sound but rather a lower pitch. I'm guessing something with wheel bearings, tires, etc. Does anyone have any experience or knowledge if this is a common issue? Any help is appreciated. Thanks.