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The pack with Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, passes over a bridge with a flooded sidewalk during the sixth stage of the Tour de France cycling race over 194 kilometers (120.5 miles) with start in Arras and finish in Reims, France, Thursday, July 10, 2014. (AP Photo/Christophe Ena) ( APTOPIX Cycling Tour de France )

The pack rides during the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (ERIC FEFERBERG/AFP/Getty Images) ( 531529839 )

Children wear rain boots as they watch the start of the sixth stage of the Tour de France cycling race over 194 kilometers (120.5 miles) with start in Arras and finish in Reims, France, Thursday, July 10, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Spain's Alberto Contador eats a banana in as he rides in the pack during the sixth stage of the Tour de France cycling race over 194 kilometers (120.5 miles) with start in Arras and finish in Reims, France, Thursday, July 10, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

Vincenzo Nibali of Italy and the Astana Pro Team retained his race leaders yellow jersey after stage six of the 2014 Tour de France, a 194km stage between Arras and Reims, on July 10, 2014 in Reims, France. (Photo by Bryn Lennon/Getty Images) ( 451973818 )

Two cycling fans in disguise wait for the pack to pass during the sixth stage of the Tour de France cycling race over 194 kilometers (120.5 miles) with start in Arras and finish in Reims, France, Thursday, July 10, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

The pack rides during the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (ERIC FEFERBERG/AFP/Getty Images) ( 531537402 )

Spain's Xabier Zandio receives medical assistance after a fall during the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (ERIC FEFERBERG/AFP/Getty Images) ( 531534585 )

France's Cyril Lemoine, wearing the best climber's dotted jersey, celebrates on the podium of the sixth stage of the Tour de France cycling race over 194 kilometers (120.5 miles) with start in Arras and finish in Reims, France, Thursday, July 10, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

Australia's Richie Porte gets off the Britain's Sky cycling team bus at the departure village in Arras prior to the start of the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (JEFF PACHOUD/AFP/Getty Images) ( 531529235 )

(From L) Netherlands' Lieuwe Westra, Italy's Vincenzo Nibali wearing the overall leader's yellow jersey and France's Cyril Lemoine wearing the best climber's polka dot jersey take the start of the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (JEFF PACHOUD/AFP/Getty Images) ( 531529590 )

(From L) France's Jerome Pineau, France's Arnaud Gerard, Netherlands' Thomas Leezer and Spain's Luis Angel Mate Mardones ride in a breakaway during the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (JEFF PACHOUD/AFP/Getty Images) ( 531529790 )

(From L) Spain's Luis Angel Mate Mardones, Netherland's Thomas Leezer, France's Arnaud Gerard and France's Jerome Pineau ride in a breakaway during the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (ERIC FEFERBERG/AFP/Getty Images) ( 531537450 )

Italy's Vincenzo Nibali wearing the overall leader's yellow jersey is pictured at the departure village in Arras prior to the start of the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (ERIC FEFERBERG/AFP/Getty Images) ( 531529172 )

Spain's Alejandro Valverde rides in the pack during the sixth stage of the Tour de France cycling race over 194 kilometers (120.5 miles) with start in Arras and finish in Reims, France, Thursday, July 10, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

The peloton exit Arras Citadelle at the start of the sixth stage of the 2014 Tour de France, a 194km stage between Arras and Reims, on July 10, 2014 in Arras, France. (Photo by Bryn Lennon/Getty Images) ( 451972024 )

French President Francois Hollande waves to the crowd from an official car as part of his visit during the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (JEFF PACHOUD/AFP/Getty Images) ( 531536796 )

Spain's Luis Angel Mate Mardones offers a flower to a hostess as he celebrates his combativity prize on the podium at the end of the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (ERIC FEFERBERG/AFP/Getty Images) ( 531535709 )

Germany's Andre Greipel celebrates as he crosses the finish line at the end of the 194 km sixth stage of the 101st edition of the Tour de France cycling race on July 10, 2014 between Arras and Reims, northern France. (LIONEL BONAVENTURE/AFP/Getty Images) ( 531534178 )