Reaction Time
Reaction · 1 / 2 / 4 min
What you do
Click when the circle turns green. Do nothing when it turns red.
Why it is useful
Fast is useless on the wrong signal. A driver who is slow to a genuine change is a problem. A driver who treats every flicker as a genuine change is also a problem. The test is withhold as much as go. If you only watch your best time, you are watching the wrong number.