Because just like that races over europe it is shot in two parts. The actual race, then they go back and do 'pretty' shots for the editors to mess with to make the actual race seem more interesting.
I guess they could do a docu-movie, death race 3 1/2 style with them racing various cars across America. They could be challenged all the way by The Stig, American Stig and African Stig. Jezza would get lynched half way through by Greenpeace, the Hamster would get eaten by the Red Necks and James would end up in Alaska.