Method and sources
How we calculate
- Every rule comes from the source listed below and is explained on the calculator's page.
- The calculation runs in your browser; the page shows the working with your numbers.
- Results are rounded only when they are displayed.
How we check
- Every rule has test cases with values taken from its source.
- All tests run automatically before each release; if one fails, nothing is published.
- Every number in tables and examples comes from the same code as the calculator.
Sources
| Rule | Source | Verified on |
|---|---|---|
| F1 start: one more pair of red lights every second, then a preset delay of 0.2 to 3.0 s before all go out | FIA, Recommended light signals for standing starts in circuit events | |
| MotoGP start: a red light displayed for between 2 and 5 seconds, the race starts when it goes out | FIM Grand Prix World Championship Regulations 2026, art. 1.18.14 | |
| Sprint start: a reaction time under 0.100 s is signalled as a possible false start | World Athletics Competition and Technical Rules 2026, TR 16.6 | |
| Reference reaction times: 1,469 adults aged 18 to 65, mean 231 ms, +0.55 ms per year of age, detection alone 131 ms | Woods et al. (2015), Factors influencing the latency of simple reaction time, Frontiers in Human Neuroscience | |
| Median of an online reaction time test (device latency included): 273 ms | Human Benchmark, Reaction Time Test |
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