Systematic, well-designed research provides the most effective approach to the solution of
many problems facing highway administrators and engineers. Often, highway problems are
of local interest and can best be studied by highway departments individually or in
cooperation with their state universities and others. However, the accelerating growth of
highway transportation develops increasingly complex problems of wide interest to highway
authorities. These problems are best studied through a coordinated program of cooperative …

BY KAY FITZPATRICK, RAYMOND A. KRAMMES AND DANIEL B. FAMBRO he use of
design speed as a primary factor in selecting a roadway's horizontal and vertical alignments
was initiated in the United States in the 1930s. Since that time, highway design criteria were
developed to suggest appropriate horizontal curve radii. superelevation rates and vertical
curve elements for new roadways. based on the selection of design speed. The practice of
basing posted speed limits on statistical analysis of individ ual vehicular speeds observed at …