Stormy weather forced saw stage eight of the Dakar Rally between Tichit and Tidjikja cancelled on Friday.
Stormy weather has halted Stephane Peterhansel's progress
The remaining competitors will now travel the 538-mile route across the Mauritanian desert together rather than under race conditions.
"The organisation has decided to modify the race," a race spokesperson said. " "Bad visibility has forced most of the (safety) helicopters to stay grounded."
So far, 31 competitors have retired from the gruelling race.
Defending champion Stephane Peterhansel holds the overall lead in the car division while fellow Frenchman David Fretigne is ahead in the motorbike race.
The next stage, due to take place on Saturday, goes between Tidikja and Atar.