I-77 crash near Rock Hill SC

Thanks for your crash link JIM BOB.
Hmm looks like a straightaway,no curves,or ramps,other than the marks on the road where it looks like he smacked the concrete.
I don't see how he turned it over?
Unless a 4 wheeler cut him off which may have caused him to over correct,when he whipped the wheel to avoid a crash?
 
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