Does the noise change when you swerve right or left? IF so, I would expect the hub bearings are bad. I've had a lot of GM's where the bearings start growling around 100K miles. A lot of times, there was no other symptom (they were tight). Replace both fronts.Thank you. The tires have been checked and are fine. When I leave the house in the morning(40 mile drive to school) the sound is barely noticeable, but gets louder the closer we get to school. It is louder and more noticeable now in the mornings and vibration is stronger the louder it gets. About 25 miles in it starts sounding like an airplane.