Image Sure, we've seen red lights before a triple to warn riders not to jump, but this was the first time we'd seen unmanned yellow caution flags. Credit GuyB Use keyboard arrow keys to browse the gallery. Swipe to browse the gallery. Prev Next 15 of 30Autoplay Autoplay SlowMedFast Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter GuyB 1/6/2011 11:37pm Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter