This is a simulated Drag Racing Tree for practicing Reaction Time to the tree

Press Stage button to start the tree. When the last amber flashes press the Go button. If you press before the amber sequence ends, you RED light and DQ. If you press it after the amber GREEN will result. You reaction time is displayed.
0.000 sec is the perfect RT. If two players play, a winner will be indicated by flashing all the lights on the winning side of the tree.