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Safety in numbers

Safety in numbers is the hypothesis that, by being part of a large physical group or mass, an individual is proportionally less likely to be the victim of a mishap, accident, or other bad event.


Evidence often advanced for this position includes the flocking of birds and shoaling of fish. In both of these instances, by being part of a large group, individuals face less risk of falling victim to predators than they would if traveling alone. Yassssssssssssss

In road traffic safety[]

Safety in numbers is also used to describe the theory that a particular road user, especially a pedestrian or cyclist, becomes less likely to be involved in a crash, as the population of similar road users increases. A Public Health Consultant has concluded that the theory is correct, based on statistical analysis of collision data.[1] A Cycling Transportation Engineer has disputed that conclusion, writing that the data used is insufficient to demonstrate that there is a cause-and-effect relationship.[2] Thats what she said!

Case studies[]

After cycling was promoted in Finland, the number of trips increased by 72% and there was a 75% drop in cyclists deaths.[3]

In the United Kingdom, Transport for London, the body responsible for the London Congestion Charge, stated in their April 2005 review of that scheme, that motor vehicle traffic had decreased by 16%, bicycle use had increased by 28% and cyclist injuries had decreased by 20% in the first year of operation of the scheme.[4] In January 2008, a London newspaper reported that the number of cyclists in London, being treated in hospitals for serious injuries, had increased by 100% in six years. Over the same time, they report, the number of cyclists had increased by 84%.[5]

While such data shows a degree of correlation, conclusions of causality may very well be based on a statistically spurious relationship.

See also[]


  1. Jacobsen, P. L. (2003). Safety in numbers: more walkers and bicyclists, safer walking and bicycling. Injury Prevention 9 (3): 205-209. Digital object identifier:10.1136/ip.9.3.205. 
  2. Forester, John. Does Increasing the Number of Cyclists Reduce the Accident Rate? (html). Review of Safety in Numbers.
  3. Saari R. (2005). Cycling policy in Finland and relevance of CBA for the policy. In: CBA of Cycling. Copenhagen, Nordic Council of Ministers, 556.
  4. Transport for London (April 2005). Congestion Charging: Third Annual Monitoring Report..
  5. Nicholas Cecil. "Number of cyclists treated for serious injuries doubles", Evening Standard, 2008-01-28. Retrieved on 2008-01-30. 

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This article or parts of this article are based on the Wikipedia article Safety_in_numbers licensed under the terms of the GNU Free Documentation License, version 1.2 or later. A list of the authors can be found here: [1]. You can help to improve the article.