Holiday travelers and spring breakers headed toward Florida early Friday faced big delays after a truckload of tuna caught fire on I-75 in Clayton County.

The southbound truck, which the state Department of Transportation reported was hauling 40,000 pounds of canned tuna, caught fire around 6 a.m. near Forest Parkway.

No injuries were reported, but authorities blocked all but one southbound lane of I-75 for more than an hour, jamming traffic back to beyond I-285.

A large percentage of the southbound traffic on I-75 before daybreak Friday was vehicles from out-of-state as motorists got a head-start on the holiday weekend.