I drove from Wisconsin to Alabama the last couple of days, I39,74 and I65. I thought something was wrong with my car. I could hear a buzzing, it kind of sounded rotational. Wheel Bearing, driveshaft turbo going, I didn't know. As I got in a bit of a backup I slowed down, the buzzing was coming from the woods and not my car. It was the huge cicada hatch. There's got to be billions of them in the woods.
They were loud enough to hear them in the car with the wind noise and everything. As I drove farther we were flying. They make a mess on the windshield and seem to dry on pretty fast.
If you are traveling through any areas of the big hatch make sure you have your windshield washer full and good wipers before you leave. These things are the size of a small hummingbird.