Risk compensation postulates that everyone has a 'risk thermostat' and that safety measures that do not affect the setting of the thermostat will be circumvented by behaviour that re-establishes the level of risk with which people were originally comfortable. It explains why, for example, motorists drive faster after a bend in the road is straightened. Cultural theory explains risk-taking behaviour by the operation of cultural filters. It postulates that behaviour is governed by the probable cos