In my group two guys went down simultaneously due to the rubber mats over the R45 Railway crossings. Looked liked the mats bubbled up, probably due to riders breaking on them. Was lucky to avoid both the crashes. Some slower (read "lighter") cyclist weaving down Hellies almost took out the "heavy train" flying down. We needed to cross the white line, but luckily managed to avoid both cyclist and traffic. Had a nice ride for my first Burger and happy with my time. All's well that ends well.