Matt Rendell explains the crucial role of Tour cartography
Matt Rendell explains the crucial role of the cartographers in mapping out every Tour de France stage: for Peter Sagan's win in Seraing, an entire roundabout had to be removed.
"Race maps, alternative routes, gradients, profiles, hotel locations, parking plans ... without hundreds of different maps, it just couldn't take place," explains Matt.
For Sagan's win in Boulogne-sur-Mer, access roads had to be opened up to let in the HGVs, while pavements were taken up in Metz to widen the final straight.
Follow ITV Cycling on Twitter
Latest Tour de France features
Video: Bradley Wiggins' Tour de France in three minutes
Music and the Tour de France are a match made in heaven, as Kraftwerk proved back in the 1980s. Here's a full list of the music ITV has used in its coverage of the 2012 Tour
Bradley Wiggins made history in 2012, becoming the first British rider to win the Tour de France
ITV Sport reporter Ned Boulting takes a look at the amazing performance of Slovakian sensation Peter Sagan aka The Tourminator in this year's Tour with three stage wins and the green points jersey in the bag