Drag Racing Reaction Time Test: The Christmas Tree
Time the Christmas tree. Leave too early and you foul out.
Why this isn't a reaction test
Because the Christmas tree drops on a fixed, repeatable cadence, the skill has nothing to do with reacting to a surprise. It is about learning the rhythm and pre-empting the green. Post a perfect 0.000 light and you were already moving as the bulb lit. That is anticipation, and precisely why the best drag racers record reaction times far below the ~100 ms human floor.
The Pro tree fires all three amber bulbs at once, green following 0.4 seconds later. The Sportsman tree steps the ambers down half a second apart for a longer, easier beat to read. Leave before the green bulb lights on either tree and you have a red-light foul: the round voids and replays, never counting toward your five.
Looking for the opposite skill, a genuinely unpredictable signal that can't be timed? Try the F1 Start Lights test, where the hold before lights-out is random.