A Symposium: Appraisal of the CBR Method

The preceding papers have presented a review of the historical development of the CBR test and its application to flexible pavement design. They also contain individual summaries of the principal traffic test sections that were constructed to check the validity of the design curves. Finally, papers are included which verify the design curves for single wheel loads and which develop principles from which design curves for any desired multiple wheel load can be prepared. It is the purpose of this concluding paper to evaluate the several component parts of the design method and to present both its virtues and its shortcomings to the end that the maximum intelligent use may be made of the method in the laboratory, for design, and on construction. It is proposed to review the method as developed, thus pointing the way to its intelligent use.