(Waupun) A semi-tractor trailer driver was seriously injured after colliding with a tree Friday morning in the Township of Waupun. Fond du Lac County sheriff’s deputies were called to Highway 26 south of Neitman Road around 8:42am. The initial investigation showed that the semi was traveling northbound on Highway 26, travelled off the roadway striking a tree. The tractor trailer sustained total damage due to the impact. The engine compartment became separated from the cab of the semi and parts were damaged after they started on fire. Several citizens also assisted with fire extinguishers. The operator of the semi, a 47-year-old man from Toledo, Ohio, was transported from the scene by Life Star Ambulance to ThedaCare Regional Medical Center in Neenah with serious injuries. He was wearing a seatbelt. The crash remains under investigation.