Road fatality rates translate raw death counts into a comparable metric that accounts for how much traffic is actually on the road network. By normalising deaths to distance travelled, analysts can compare safety performance across regions, time periods, or road types regardless of traffic volume.
The most common expression is the number of fatalities per 100 million vehicle‑miles travelled. This scale mirrors the way traffic engineers report crash frequencies, making the statistic intuitive for both policymakers and the public.
VMT = vehicle miles travelled (in millions)
R = fatality rate per 100 million vehicle miles
A higher rate signals a safety problem that may stem from road design, driver behaviour, or enforcement gaps. Tracking the rate over successive years helps evaluate the impact of interventions such as speed‑limit changes or infrastructure upgrades.
What is a road fatality rate?
How do I calculate the road fatality rate?
Why is normalizing by vehicle-miles important?
What does the number of fatalities per 100 million vehicle-miles tell us?
Can this rate be used for different time periods?
Is this metric applicable to all types of roads?
How does this rate differ from raw fatality counts?
Results are for informational purposes only and do not constitute professional advice.