As there is no human behaviour with total certainty of outcome, all be
haviour may be viewed as risk taking. Notions such as risk perception
and risk acceptance are, therefore, central to the understanding of be
haviour, including behaviour in traffic and the causation of accidents
. This paper presents the basic features of risk homeostasis theory (R
HT) and explains how this theory may help to understand the causation
of the accident rate and how it may be used to develop an effective ac
cident-prevention strategy. Empirical examples demonstrating the lack
of effectiveness of current engineering, education, and enforcement pr
actices in reducing the accident rate are given, and the prevention of
accidents that can be, and has been, achieved by properly designed in
centive programmes for safety is pointed out.