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Risk compensation
Risk compensation is a theory which suggests that people typically adjust their behavior in response to the perceived level of risk, becoming more careful where they sense greater risk and less careful if they feel more protected. Although usually small in comparison to the fundamental benefits of safety interventions, it may result in a lower net benefit than expected.〔Vrolix (2006) "Behavioural adaptation generally does not eliminate the safety gains from programmes, but tends to reduce the size of the expected effects"〕
By way of example, it has been observed that motorists drove faster when wearing seatbelts and closer to the vehicle in front when the vehicles were fitted with anti-lock brakes. There is also evidence that the risk compensation phenomenon could explain the failure of condom distribution programs to reverse HIV prevalence and that condoms may foster disinhibition, with people engaging in risky sex both with and without condoms.
By contrast, shared space is a highway design method which consciously aims to ''increase'' the level of perceived risk and uncertainty, thereby slowing traffic and reducing the number of and seriousness of injuries.
==Overview==
Risk compensation is related to the broader term behavioral adaptation which includes all behavior changes in response to safety measures, whether compensatory or not. However, since researchers are primarily interested in the compensatory or negative adaptive behavior the terms are sometimes used interchangeably.〔Vrolix (2006) "A term, closely related to risk compensation, is ‘behavioural adaptation’. Behavioural adaptation is a wider term referring to all behavioural changes triggered by a safety measure (OECD, 1997). Strictly spoken, this includes all positive and negative behavioural changes induced by road safety measures. Nevertheless, the emphasis is primarily put on the negative aspects of this phenomenon."〕 The more recent version emerged from road safety research after it was claimed that many interventions failed to achieve the expected level of benefits but has since been investigated in many other fields.〔Vrolix (2006) "Risk compensation is the term given to a theory which tries to understand the behaviour of people in potentially hazardous activities. In the context of the road user, risk compensation refers to the tendency of road users to compensate for changes in the road system that are perceived as improving safety by adapting behaviour (Elvik and Vaa,2004). So measures, designed to improve traffic safety, may bring along negative consequences in a way that individuals increase the riskiness of their driving behaviour because they feel safer (Dulisse, 1997)"〕〔Hedlund (2000) "The early risk compensation literature deals with road safety... Several recent studies examine risk compensation in response to both aggregate and specific consumer product and workplace safety regulations"〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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