Patrick Quincy said that the markers and information given at the Meribel resort where the accident happened conformed to French laws.
Michael Schumacher, 45, legend has been in intensive care since the incident on December 29.
The former Formula 1 champion was skiing off-piste when he fell and hit his head on a rock.
Investigators found that the rock which caused Michael Schumacher to fall was 34 ft away from the rock on which he hit his head.
Both the rocks were more than 4m from the edge of the piste.
The seven-time world racing champion remains in hospital in Grenoble.
His spokeswoman said on January 30 that the medical team was reducing his sedation to prepare to gradually bring him out of a coma.
Michael Schumacher retired from racing in 2012 after a 19-year career.
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