Ralf Schumacher has played down the possibility that F1 could fill in the gaps in a cobbled-together 2020 calendar with 'reverse' races.
Charles Leclerc said last week that he likes the idea of heading to a circuit and racing on it several times - including in the opposite direction to normal.
But former F1 driver Schumacher said that will almost certainly not be possible.
"The circuits are all designed with the run-off zones based on a certain speed of the corners," he told Sky Germany.
"You can't just do it the other way around because for many sections it wouldn't work - including the pit entrances," Schumacher added.
"But it's a funny idea that you can do online."
