The tire slammed into the windshield and roof of the man's Toyota before he lost control and crashed into the center divider wall, investigators said.
Firefighters continued working Sunday to battle a stubborn, massive brush fire in Lakeview, one of four wildfires that have erupted amid scorching temperatures in Riverside County.
A raging wildfire in Riverside County has now burned 7,000 acres and is 5% contained.
Three brush fires spread to nearly 4,000 acres in Riverside County communities.
A Beaumont babysitter accused of killing a 15-month-old boy by inflicting severe head trauma, as well as abusing another boy, pleaded not guilty to murder and other charges.
A 37-year-old Riverside woman has been arrested for allegedly causing the death of a 15-month-old child she was babysitting in Beaumont, police said.