Chris Froome called on Tour de France organisers to end today's showpiece double ascent of the Alpe d'Huez early if forecast thunderstorms strike.
Although race director Jean-Francois Pescheux denied there was any possibility of the 100th Tour's signature stage being shortened, Froome said rider safety had to come first and existing concerns over the descent of the Col de Sarenne - which separates the two climbs of the famed Alpe d'Huez - have only increased amid the weather forecasts.
"I think it would be sad not to do the planned parcours and the two ascents of Alpe d'Huez as it's something special to go along with the 100th Tour de France," Tour leader Froome said after increasing his advantage over Alberto Contador with victory in Wednesday's time trial.
"But having said that, safety definitely comes first. It's a dangerous descent but if it starts raining I would hope the race organisers make the decision to make it just one climb. The safety of riders has to come first."
The inclusion of the Sarenne has long been controversial, with several riders speaking out in the build-up to the Tour after riding on the route either in training or during its trial in the Criterium du Dauphine last month.
Tony Martin branded the route "irresponsible" before the start of this Tour, while Andy Schleck said he "could not understand" why riders were being asked to use it. The road is narrow and twisty, devoid of safety barriers and with a worn surface.
The 21 hairpins of the Alpe d'Huez have become one of the most familiar images of the Tour in recent years.
Although the climb did not make its Tour debut until 1952 and then did not feature again until 1964, it has been a mainstay on the route since 1976, the famous bends providing a natural amphitheatre filled with hundreds of thousands of fans who camp out for days in anticipation.
Crowds are notoriously hard to measure on the mountain, with estimates ranging anywhere between a few hundred thousand to a million, but a bumper crowd is guaranteed tomorrow given the chance to see the riders climb towards the heavens not once but twice. Whether or not those heavens are raining down on them at the same time remains to be seen.
And while Froome would be happy to see the stage shortened in that event, he insisted he would not hide away if made to ride the course in full.
"I completely understand that at the end of the day all the riders will be in the same conditions," he said. "If we have to do the dangerous descent in the wet we'll be up for it.
"Everyone is in the same boat as us in that regard. I just hope that it is not going to come to that."