this video show you how to do possibly the greastest shortcut on rainbow road or/and mkds ever! Its during the first turn and using the boost pad on the floor u jump to the road above you. watch the video to see it. unfortunately i wasnt able to do it right and lakuta was posting his reverse sign...um...sounds like a glitch????maybe. Also if you fall you will be placed back to where u had jumped off but thats only after a certain point. I have actually done it cuts a lot of the time if done right.