Voeckler has vowed to fight to retain his overall lead.
"It was a wet and stressful day, but one more day in the yellow jersey is great," he said.
"To be honest I expect to lose it tomorrow but it doesn't mean I'm not going to fight to keep it."
His Europcar team director Jean-Rene Bernaudeau was not so defeatist.
"Thomas will never admit it but I think he can keep it unless the favourites attack as early as the first climb," he said.
"If they wait for the last climb, I don't see Thomas losing 2:30 on it."
Text pinched from the ABC
Photo from Zimbio.com