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 left-right turn to move the track away from the warehouses and buildings after a crash where during that 1966 12 Hours a privately-entered Porsche went into one of the warehouses ( this area was off-limits to non-track personnel ) and into a crowd , killing four spectators .
Sebring International Raceway