This accident took place in Mexico. A man allegedly tried to cross a freeway but got hit by a car. His femur bone, the strongest bone in the body dislocated at the hip joint and ended up exposed, sticking out of the thigh. His head suffered from severe trauma as can be seen by indistinct, but present leakage of blood in the photo of the body on the freeway.
The mortician (forensic pathologist) who worked on the corpse opened the skull and removed the brain for examination. Apparently this is a standard procedure and part of the autopsy routine. Not sure why after getting hit by a car the man ended up in his underwear. It’s usually shoes that fly off the feet, but judging by that gash on his thigh that dislocated his femur, he did take some pretty heavy hit in that area which could be the reason why his pants are off.
Gallery of a Mexican man who was killed trying to cross a freeway is below: