A semi-truck caught fire on I-75 in Hernando County, causing major delays during rush hour traffic on Tuesday, according to the Florida Highway Patrol. Image 1 of 3 ▼ Courtesy: Florida Highway Patrol. Sumter County Fire Rescue and Hernando County Fire Rescue are on scene near mile marker 305. I-75 southbound has been moving slowly with cars passing only on the shoulder for several hours. The Source: Information for this story was provided by the Florida Highway Patrol and Hernando County Fire Rescue.