Epidemiology of motor vehicle collisions

Deaths for road traffic collisions per 100,000 inhabitants in 2012.^[1]

  no data

  less than 5

  5-10

  10-15

  15-20

  20-25

  25-30

  30-35

  35-40

  more than 40

Road fatalities per 1 billion vehicle-km in 2004

  no data

  < 5.0

  5.0-6.5

  6.5-8.0

  8.0-9.5

  9.5-11.0

  11.0-12.5

  12.5-14.0

  14.0-15.5

  15.5-17.0

  17.0-18.5

  18.5-20.0

  > 20.0

Worldwide it was estimated that 1.25 million people were killed and many millions more were injured in motor vehicle collisions in 2013.^[2] This makes motor vehicle collisions the leading cause of death among young adults of 15-29 years of age (360,000 die a year) and the ninth cause of death for all ages worldwide.^[3] In the United States, 32,675 people died and 2.3 million were injured in crashes in 2014.^[4] It is estimated that motor vehicle collisions caused the deaths of around 60 million people during the 20th century,^[5] around the same as the number of World War II casualties.

Modern crash statistics often focus on reportable injury crashes (which include deaths) rather than reporting on deaths alone. It is believed that serious crashes are often significantly under-reported, under-recorded and misclassified^[6] and that the completeness of reporting may vary over time and between sources.^[7]

Trends

US annual deaths per billion vehicle miles traveled (VMT) vs annual VMT (tens of billions), 1921 to 2015.

Road toll figures in developed nations show that car collision fatalities have declined since 1980. Japan is an extreme example, with road deaths decreasing to 5,115 in 2008, which is 25% of the 1970 rate per capita and 17% of the 1970 rate per vehicle distance travelled. In 2008, for the first time, more pedestrians than vehicle occupants were killed in Japan by cars.^[8] Besides improving general road conditions like lighting and separated walkways, Japan has been installing intelligent transportation system technology such as stalled-car monitors to avoid crashes.

In developing nations, statistics may be grossly inaccurate or hard to get. Some nations have not significantly reduced the total death rate, which stands at 12,000 in Thailand in 2007, for example.^[9]

In the United States, twenty-eight states had reductions in the number of automobile crash fatalities between 2005 and 2006.^[10] 55% of vehicle occupants 16 years or older in 2006 were not using seat belts when they crashed.^[11]

Road fatality trends tend to follow Smeed's law,^[12] an empirical schema that correlates increased fatality rates per capita with traffic congestion.

Proportion of deaths by type of impact

According to Eurostat the automobile is one of the less safe means of transport, if safety is measured as the less number of fatalities per travelled distance. Based on data by EU-27 member nations, 2008-2010.^[13][14]

Crashes are categorized by what is struck and the direction of impact, or impacts. These are some common crash types, based on the total number that occurred in the U.S.A. in 2005, the percentage of total crashes, and the percentage of fatal crashes:^[15]

• Rear impacts (1,824,000 crashes, 29.6% of all US crashes, 5.4% of US fatal crashes)
• Angle or side impacts (1,779,000 crashes, 28.9% of all US crashes, 20.7% of US fatal crashes)
• Run-off-road collisions (992,000 crashes, 16.1% of US crashes, 31.7% of US fatal crashes)
• Collisions with animals (275,000 crashes, 4.5% of US crashes, 0.4% of fatal crashes)
• Rollovers (141,000 crashes, 2.3% of all US crashes, 10.9% of US fatal crashes)
• Head-on collision (123,000 crashes, only 2.0% of all US crashes, but 10.1% of US fatal crashes)
• Collisions with pedestrians and bicyclists (114,000 crashes, only 1.8% of US crashes, but 13.5% of US fatal crashes)
• Back-up collisions killed 221 people in the US in 2007, and injured about 14,400. This is one of the most common types of non-traffic auto collision in which road workers and children 15 and younger are killed.^[16][17]

Rollover, head-on, pedestrian, and bicyclist crashes combined are only 6.1% of all crashes, but cause 34.5% of traffic-related fatalities.

Sometimes the vehicles in the collision can suffer more than one type of impact, such as during a shunt or high-speed spin. This is called a "second harmful event," such as when a vehicle is redirected by the first crash into another vehicle or fixed object.

Statistics in Europe

Source IRTAD for the following data

Number of vehicles: 2005 except Ireland 2003; Luxembourg 2004; Slovakia 2002.

Length of the network: 2005 except Hungary and Luxembourg 2004; Germany and Denmark 2003; Slovakia 2002; Iceland 2000; Ireland 2001; Netherlands 1999; Greece and United Kingdom 1998; Portugal 1993; Italy 1992.

Distance in Kilometres: 2005 except Denmark 2004; Italy and Netherlands 2003; Ireland 2001; Iceland and Slovakia 2000; United Kingdom and Greece 1998.

Population: source IRTAD except for Ireland, Luxembourg, Slovakia, Sweden, Iceland and Norway: source INED.

See also

• Road-traffic safety
• Management systems for road safety
• Smeed's law

Nations:

• List of motor vehicle deaths in Australia by year
• List of motor vehicle deaths in Japan by year
• List of motor vehicle deaths in U.S. by year

Notes

References

Traffic collisions
Main topics	Epidemiology Bus plunge Hit and run Park-to-reverse Roadside memorial Rollover Vehicle extrication Vehicle recovery Traffic collision reconstruction
Road collisions	Back-up collision Deer–vehicle collisions Head-on collision Multiple-vehicle collision Rear-end collision Run-off-road collision Side collision Single-vehicle crash
Chronology	List of traffic collisions Before 2000 2000–09 2010–2014 2015-present
Related lists	List of bridge failures List of level crossing crashes
Category