Speed vs Safety Tool
Interactive explainer for how speed, reaction time, and road grip affect stopping distance, impact energy, and pedestrian injury risk.
Total stopping distance
106 ft
- Impact energy
- 135 kJ
- Pedestrian fatality risk
- 7%
- Serious injury risk
- 37%
- μ
- 0.75
Stopping distance uses v² / (2μg) plus reaction distance. Injury curves are logistic approximations of published pedestrian-impact studies (Tefft / Rosen-style), not a legal or medical opinion.
Kinetic energy scales with the square of speed. Braking distance does too. That is why a 'slightly faster' urban pass is not a slight change in outcome for a pedestrian. Use the sliders; the geometry is the argument.
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