Bosses have reportedly dismissed moves to enclose the cockpits of Formula One cars.
Technical chiefs began to investigate the possibility of jet fighter-style canopies for the cockpits in the wake of Felipe Massa's near-fatal crash in Hungary two years ago.
"You can have covers and you can have canopies, but you also have to be able to get at a driver to extract him. There are a lot of secondary considerations," said Ross Brawn.
According to the Daily Mirror, F1 chiefs have rejected the idea of a roof over the drivers' heads.
The report said the FIA had considered "poly-carbonate screens" for the cars, but "drivers fear the device could prevent escape in the event of a car overturning or catching fire", while spectators would be "at danger from flying debris ricocheting off the screens".