有人知道這是什麼比賽嗎? "Derny"

有趣的比賽---> 我太無知了!!???

Tommy Simpson Derny Crit Berlin 1964
http://www.youtube.com/watch?NR=1&v=B_eE_da8_xI

Uci - Centro mondiale di ciclismo a Aigle in Svizzera
http://www.youtube.com/watch?v=BK0n8BU-Tqk&NR=1

dernycriterium Antwerpen 2011
http://www.youtube.com/watch?v=AgSdUkGPTyo