NFL running back Isaiah Pead was driving at speeds north of 90 mph when he lost control of his car, hit a guardrail and plummeted 40 feet down the side of a freeway ... witnesses told police.
TMZ Sports obtained the 911 calls made moments after the 26-year-old's car crashed in Columbus, OH around 2 AM on Saturday morning ... and the witnesses were clearly scared for Pead's life.
"We just saw a car totally wipe out and crash," one witness said ... "It's on the side of the road. It's totally f**king crashed.