Bobby Isaac's #37 Dodge skids off the course during the Jan. 21 1968 Motor Trend 500 at Riverside International Raceway as Dan Gurney passes in the #21 Wood Brothers Ford. Isaac recovered to finish seventh. Gurney went on to win, his fifth win in his last six Grand National starts at the track. It was the first NASCAR Grand National event that included protective screens in the driver's window. The window screens use weren't mandated by NASCAR until 1970.