Abstract
The report contains 87 entries relating to issues, methods, and results of research concerned with the measurement of highway travel exposure to the risk of accident, many focusing specifically on the measurement of vehicle miles travelled as the denominator in the calculation of accident rates for different categories of driver, vehicle, and environmental characteristics. Included are studies which make use of existing public record data; studies which obtain data by roadside counting, roadside observation, and roadside interview; and studies which obtain data by home and licensing office interviews and questionnaires.