Drag Racing Reaction Time Test
Time the Christmas tree. Leave too early and you foul out.
Why this isn't a reaction test
The Christmas tree drops on a fixed, repeatable cadence — so the skill isn't reacting to a surprise, it's learning the rhythm and pre-empting the green. A perfect 0.000 light means you were already moving as the bulb lit. That's anticipation, and it's exactly why the best drag racers post reaction times far below the ~100 ms human floor.
The Pro tree flashes all three amber bulbs at once with green 0.4 seconds later. The Sportsman tree steps the ambers down half a second apart, giving a longer, easier beat to read. Leave before the green bulb lights on either tree and it's a red-light foul — the round voids and replays, and it never counts toward your five.
For the opposite skill — a truly unpredictable signal you can't time — try the F1 Start Lights test, where the hold before lights-out is random.