A study was undertaken of 725 Vermont drivers with ischemic heart disease, representative of such drivers within the community, whose crash rates were compared with those of all Vermont drivers and with matched samples of drivers of similar sex and community of residence and of similar age, sex and community of residence. The drivers with heart disease had lower overall crash rates and rates of property damage, injury and single vehicle crashes than did the other groups, but this is believed to reflect the fact that many of these predominantly older individuals were able both to reduce their annual mileage and to limit their driving to less hazardous times and circumstances. The results of this study, therefore, are not necessarily applicable to disease conditions that affect predominantly younger individuals or to commercial drivers.