Truckers using Interstates 75 or 10 in northern Florida faced the possibility of intermittent highway closures Monday because of smoke from wildfires.

According to The Associated Press, a fire that was sparked by lightning has burned nearly a quarter of a million acres in Georgia’s Okefenokee Swamp, and has spread into northern Florida.

Sections of I-75 and I-10 were closed Saturday and reopened briefly on Sunday before being shut down again when dense smoke limited visibility, The AP reported.