A man died early Sunday morning when his speeding silver Infiniti crashed through a retaining wall on I-285 in Cobb County.

Cobb County police report the 2003 Infiniti G35 sped southward along South Cobb Drive around 2:30 a.m. before leaving the roadway, dropping into a ravine and up onto I-285 westbound. The car then plowed through the retaining wall before stopping in the eastbound 285 lanes.

The driver, identified as 51-year-old Walter Alan Mitchell of Atlanta, died at the scene.

The wreck closed the interstate before dawn, but all lanes had reopened by 6 a.m.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools