Bad weather denied Mick Schumacher his Formula One practice debut and wiped out track action at the Eifel Grand Prix on Friday, with the medical helicopter grounded by fog and cars unable to run.
Organisers had set the clock running for the 90-minute opening session at a cold and damp Nuerburgring but kept the pit lane exit closed.
After half-hourly updates, they announced there would be no running. The afternoon session at the German circuit was similarly timed out.
Schumacher, the Formula Two championship leader and son of seven-times world champion and former Ferrari great Michael, had been due to replace Italian Antonio Giovinazzi at Alfa Romeo for the morning only.