It is possible to have internal bleeding that is not apparent until it is too late. As blood oxygen levels are reduced, cognition is impacted. Could a confused person put on two different shoes at take off down the road? Jerk silver chain off neck, breaking it into pieces? Remove shorts and then collapse on the side of the road?
That road is very dark at night and early morning. Wasn’t sunrise around 7 that day? Anyone driving by would be going to work and in the auto-pilot mental state of doing a daily commute. The oil transport industry does not keep the same holiday schedule and many would not be off for Memorial day.
So, is it possible that a large vehicle could have impacted a deceased person, causing massive injuries that do not bleed but are still capable of oozing/being absorbed by a covering?
The autopsy shows bilateral scapular fracture, which by itself is a rare injury and requires tremendous force. This, combined with the skull, rib, and vertebral fractures paint a picture of someone not able to walk. But what if these happened very shortly after death?