Driving
3 figures covering driving, fastest first.
| What | Typical | Range | Kind | What is measured |
|---|---|---|---|---|
| Driver reaction to an expected event | 850 ms | 700 ms–1 s | Reaction | Alert driver, anticipating the need to brake; time from stimulus to the brake pedal moving. |
| Driver reaction to a surprise | 1.35 s | 1.10 s–1.80 s | Reaction | Unanticipated hazard — a car pulling out, an obstacle appearing; time to the brake pedal. |
| The 2.5-second road design figure | 2.50 s | 2.50 s–2.50 s | Design value | The perception-reaction time assumed when calculating stopping sight distance for road geometry. |
- Driver reaction to an expected event 850 ms
- Driver reaction to a surprise 1.35 s
- The 2.5-second road design figure 2.50 s
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