Many authors have suggested that some deaths resulting from road traffic accidents are in fact suicide. The purpose of this study was to examine the circumstances of single road traffic deaths in County Mayo, Ireland, over the 15-year period from 1978 to 1992 inclusive. Using the information available from the coroners' files, evidence was sought to support the hypothesis that some accidental deaths may have been disguised suicides. The authors could find no conclusive evidence to suggest that this hypothesis was true. However, there was suspicion of suicide in six (4.5%) of the 134 fatalities examined. Interesting data regarding gender differences, seasonality, time of accident, and the consumption of alcohol were found.