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A screen test measures a simple, expected reaction, and your device adds a few milliseconds. Real hazards take longer to notice; highway engineers design for 2.5 seconds. Don’t take this test while driving.
Make it a contest
- Class or workshop: everyone takes the test, then again while answering “What’s 7 × 8?” out loud. Compare the averages: that’s what a conversation or a phone does to reaction time.
- Family night: grown-ups vs. kids. Then turn the winning time into feet at 45 mph.
Fun facts (and not-so-fun facts)
- Speeding was a factor in 29% of all US traffic deaths: 11,288 people.NHTSA, 2024
- Sending or reading a text takes your eyes off the road for 5 seconds. At 55 mph, that’s like driving the length of a football field with your eyes closed.NHTSA, current guidance
- Per mile driven, drivers 16 to 19 have a fatal crash rate almost 3 times that of drivers 20 and older.CDC
Questions people ask us
What is a good reaction time?
On a screen test like this, when you know the signal is coming, many people land around a quarter of a second. Real driving is slower: you have to notice a hazard you weren’t expecting, decide and move your foot. That is why highway engineers design for 2.5 seconds.
Is my score stored anywhere?
No. The test runs only in your browser. Nothing is sent or saved.
