How a drag-racing reaction time works
On the strip, the "Christmas tree" drops three amber bulbs and then a green. Your reaction time is the gap between the green light and you leaving the line — not the whole run. A good street reflex is around 0.250 s; sharp bracket racers live near 0.150 s; a perfect light is 0.000. Leave before green and it's a red light — an automatic loss.
This tester uses a sportsman-style sequence: the ambers fall one at a time, then green. Anticipating the rhythm helps, but jump the gun and you foul. It's pure human reflex — most people can't beat about 0.15 s, so if you're seeing 0.05 s you probably guessed.
FAQ
What's a good reaction time?
For casual players, anything under 0.300 s is solid and under 0.200 s is quick. Human visual reaction bottoms out around 0.15 s, so genuine sub-0.100 s lights usually mean you anticipated rather than reacted.
Does this match a real drag strip?
The reflex part is the same idea, but a real tree also factors roll-out and your car actually moving. Here we measure pure light-to-input reaction, so treat it as reflex practice, not a track prediction.