On their way home from a road trip last October, Denise Brennan said she and her husband Mike saw a large tractor mowing near the roadway on I75. Out of precaution, she moved from the outside to the center lane. But it was too late. Seconds later, she saw what looked like a large piece of asphalt shoot out from the tractor’s blade and crash into their Jeep. “And all of a sudden, we just heard like a big bang,” Denise said.