[CaptainSlow]

Could it just be rocks hitting inside the fenders? It is coming out of winter...maybe they are doing some localized repair work and a bit of asphalt is getting picked up by the tires? I know they are notorious for doing that around here...just drive around with a big trailer full of hot asphalt and just shovel it out into pot holes and expect cars to pack it down (which is the laziest possible way to do anything, really)