A privately-entered Porsche killed four spectators at Sebring International Raceway during the 1966 12-hours , which prompted the organizers to install a left-right turn .
Another dangerous section was the Warehouse straight , where the organizers installed a chicane to move the track away from the warehouses and buildings after a crash where a Porsche went into one of the warehouses and into a crowd .
Sebring International Raceway