Previous experimental tests of risk homeostasis theory (RHT) have failed to manipulate both motivational and nonmotivational variables in an ecologivally valid within-subjects design. In this study, 24 Ss operated an interactive driving simulator under varying levels of a within-subject motivational factor (monetary accident cost), a within-subject nonmotivational factor (speed limit), and a between-subjects nonmotivational factor (speeding fine). Consistent with RHT, increased speed limit and reduced speeding fine significantly increased driving speed but had no effect on accident frequency. Moreover, increased accident cost caused large and significant reductions in accident frequency but no change in speed choice
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Jackson et al. (1994) studied this question.
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