Samenvatting
This is a condensation by once of the first part of a much longer report bearing the same title. A similar condensation of the second part of this report is planned publication as "Analysis of Accidents for Causes". The original report was one of a number of reports prepared in connection wit Experimental Case Studies of Traffic Accidents supported by the United States Public Health Service (RG-5359) United States Bureau of Public Roads (CPR 11-5981) and the Automotive Safety Foundation.