METHODOLOGY

The majority of our report concerns the analysis of primary data obtained from an existing field survey conducted by Bikecentennial to eliminate hazards and improve safety along the TransAmerica Trail. Of the 4,065 cyclists who participated in Bikecentennial, 3,507 were sent the safety survey through bulk mailing techniques. The remaining 556 riders included nearly 400 international bicyclists and 156 domestic riders who could not be contacted due to the expense of overseas mail, or insufficient mailing information. Ultimately, Bikecentennial received more than 2,350 completed surveys from the riders. Of these, 2,069 arrived early enough to be tabulated. and formed the basis for the data, conclusions, and recommendations presented herein.

The 67.0% rate of return (2,350 of 3,507) insures us of a very low sampling error. Through random phone calls, and (compared) early and late returns, we concluded that the respondents are typical of the total rider population.

Other portions of the report are based on exploratory research using such secondary data as, literature surveys, existing field surveys of law enforcement officials (Bikecentennial Law Enforcement Information Report), and analysis of selected accident cases. In addition, we were able to draw from medical records, insurance reports, and letters from the bicyclists.

SURVEY DESIGN

The Bikecentennial survey included 141 questions, divided into two broad sections. The first section dealt with general information that could be answered by all participants. The second section was intended only for those persons who experienced accidents on the TransAmerica Bicycle Trail during 1976. In the first section, questions were posed that allowed us to develop a detailed rider profile and evaluate the route. The second section allowed us to determine the cause of each accident and surrounding conditions. Many of the questions in the Bikecentennial questionnaire were taken from a National Safety Council study, in a report by Schupack and Driessen, entitled "Bicycle Accidents and Usage Among Young Adults: A Preliminary Study" so that the results could be compared directly. In addition to keypunching the data, we read each accident form to gain insights into the specific problems of the cyclists.