When designing a specific curve of radius ( R ), solve for e:
Open Excel and create the following columns (example row 1 for headers, data from row 2): superelevation calculation excel sheet
: = (90^2/(127*400)) - 0.13 = (8100/50800) - 0.13 = 0.159 - 0.13 = 0.029 → 2.9%. Since 2.9% < 6%, use 2.9%. When designing a specific curve of radius (
You cannot use a constant friction factor. AASHTO provides polynomial or tabulated values: superelevation calculation excel sheet