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Stage winner Marcel Kittel of Germany celebrates his third victory on the podium of the fourth stage of the Tour de France cycling race over 163.5 kilometers (101.6 miles) with start in Le Touquet and finish in Lille, France, Tuesday, July 8, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Rain clouds spell trouble for the riders as the pack heads towards Lille during the fourth stage of the Tour de France cycling race over 163.5 kilometers (101.6 miles) with start in Le Touquet and finish in Lille, France, Tuesday, July 8, 2014. The hectic pace of the first week combined with wet roads are at the origin of crashes in the pack. (AP Photo/Christophe Ena) ( Cycling Tour de France )

The pack rides during the 163.5 km fourth stage of the 101st edition of the Tour de France cycling race on July 8, 2014 between Le Touquet-Paris-Plage and Lille, northern France. (ERIC FEFERBERG/AFP/Getty Images) ( 531460746 )

Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, and Peter Sagan of Slovakia, wearing the best sprinter's green jersey, ride shoulder-to-shoulder during the ceremonial procession prior to the start of the fourth stage of the Tour de France cycling race over 163.5 kilometers (101.6 miles) with start in Le Touquet and finish in Lille, France, Tuesday, July 8, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

The pack with France's Jean Marc Marino, far left, passes over cobblestones in Cassel, during the fourth stage of the Tour de France cycling race over 163.5 kilometers (101.6 miles) with start in Le Touquet and finish in Lille, France, Tuesday, July 8, 2014. (AP Photo/Christophe Ena) ( APTOPIX Cycling Tour de France )

Marcel Kittel of Germany and Giant-Shimano crosses the line to win the fourth stage of the 2014 Tour de France, a 163km stage between Le Touquet-Paris-Plage and Lille, on July 8, 2014 in Lille, France. (Photo by Bryn Lennon/Getty Images) ( 451850964 )

Spain's Luis Angel Mate Mardones (R) and France's Thomas Voeckler ride in a breakaway during the 163.5 km fourth stage of the 101st edition of the Tour de France cycling race on July 8, 2014 between Le Touquet-Paris-Plage and Lille, northern France. (JEFF PACHOUD/AFP/Getty Images) ( 531459033 )

Britain's Christopher Froome injured rides in the pack after a fall during the 163.5 km fourth stage of the 101st edition of the Tour de France cycling race on July 8, 2014 between Le Touquet-Paris-Plage and Lille, northern France. (JEFF PACHOUD/AFP/Getty Images) ( 531460631 )

Chris Froome of Great Britain and Team Sky receives medical attention after being involved in a crash early in the race during stage four of the 2014 Le Tour de France from Le Touquet-Paris-Plage to Lille on July 8, 2014 in Le Touquet-Paris-Plage, France. (Photo by Doug Pensinger/Getty Images) ( 451850700 )

Spectators wave the French flag as France's Thomas Voeckler, right, and Spain's Louis Angel Mate Mardones, pass as they ride in the breakaway during the fourth stage of the Tour de France cycling race over 163.5 kilometers (101.6 miles) with start in Le Touquet and finish in Lille, France, Tuesday, July 8, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, looks at the trophy as he celebrates on the podium of the fourth stage of the Tour de France cycling race over 163.5 kilometers (101.6 miles) with start in Le Touquet and finish in Lille, France, Tuesday, July 8, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )