Despite their neglect by researchers relative to other causes of death, motor vehicle and other accidents contribute substantially to sex differences in mortality and address theoretical debates over the consequences of gender equality. A reduction-in-protection hypothesis argues that gender equality reduces the female advantage in accident mortality, a reduction-in-inequality hypothesis argues that gender equality increases the advantage, and an institutional adjustment hypothesis argues that gender equality initially reduces and then increases the advantage. The analysis tests these hypotheses using data on age-specific male and female accident mortality rates and indicators of work and family status for 18 high income nations from 1955-1994. In support of the institutional adjustment hypothesis, declining differentials in male and female motor vehicle and other accident mortality rates level off and sometimes increase in recent years, and measures of work and family change generally have similar curvilinear influences on the differential. Across nations, gender equality speeds the reversal in the differential for motor vehicle accidents, but not for other accidents.