Gallas got out of the buggy and waved to his team-mates to indicate he had not been hurt in the crash, a Reuters photographer at the scene reported.
The defender escaped with just a graze on his left hand, a team spokesman said.
The former Arsenal skipper is recovering from a calf injury and has been back in training for several days, suggesting he will be fit to take part in the June 11-July 11 finals in South Africa.
France, in a week-long training camp at this scenic ski village, have been taking part in activities such as hiking up a glacier and an introduction to biathlon, a mixture of cross-country skiing and shooting.
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