Tour de France: Fearless cyclists face new danger – selfies

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Story highlights

Millions line streets of Britain again for Tour de France

Third stage finishes in London on the Mall

Marcel Kittel of Germany wins his second stage of race

Tour 'selfies' have been a problem for the riders

CNN  — 

The Tour de France is arguably the world’s toughest event – but it’s just got a whole lot tougher.

One of the few sporting occasions where fans don’t pay to watch its stars, one of the Tour’s charms has been allowing its followers to get up close and personal. You are literally in touching distance of your heroes.

That’s especially true on the arduous climbs in the Pyrenees and the Alps where hundreds of thousands of cycling fanatics line the roads.