and it turns out to be a plastic bag !
One day a few years ago this happened to me and after I passed the 'white thing " ... I thought " HEY that was an ANGEL head !!!! "
I turned around on this dangerous road > and I got the head .
Don't worry ... I went and asked if it belonged to the cemetery that was nearby . They said no and that I could keep the head
so .... it's not always a plastic bag on the side of the road !!! keep looking !