Slower vehicle speeds dramatically reduce injuries & deaths
Submitted by Brent Hugh on Thu, 01/29/2004 - 5:45pm
Michael Paine has compiled much interesting research into the how vehicle speed affects the amount of collisions, injuries, and fatalites. A few excerpts:
Swedish research (Nilsson 1993) into speed limit changes throughout the developed world suggests a fourth power relationship between mean traffic speed and the proportion of fatal crashes. A 3% reduction in mean traffic speeds can produce a 12% reduction in fatal crashes.On another page he adds this tidbit:
The faster a motorist is travelling the less chance they have of avoiding a crash and the higher the impact speed if they do crash. This double whammy effect means that travelling at just 5km/h over the speed limit doubles the risk of being involved in a serious or fatal crash . . .
[S]tudies in the USA have shown that, in effect, every minute saved by travelling in excess of the speed limit results in a one minute loss in life expectancy across the community due to the increased risk of a fatal crash.
At 20km/h [12MPH] 4% of collisions are fatal. This rises to 9% at 30km/h [18MPH], 25% at 40km/h [24MPH] 83% at 50km/h [30MPH] and, in effect, 100 % at 60km/h [36MPH].Other relevant facts:
- Pedestrians have represented 11-17 percent of all U.S. motor vehicle deaths since 1975.
- In 2001, pedestrian deaths made up almost one- fourth of traffic deaths among 5-9 year-olds
- In 2001, pedestrian deaths made up 16 percent of traffic deaths among people age 70 and older.
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