With Roberts on lap 109, the car driven by Bob Swanson lost control and went sideways. Roberts' car contacted Swanson's, causing Swanson's car to eject Swanson, flip over, and catch fire, while Roberts' car went through the outer wall. Attempting to avoid the accident, Chet Miller swerved into the debris field.
On lap 109, as Roberts was leading, Bob Swanson's car lost control and veered off course. This collision caused Swanson's vehicle to eject him, flip over, catch fire, while Roberts' car passed through the outer wall. Chet Miller attempted to avoid the accident by swerving into the debris field.