Abstract:
Curves have always been a safety concern in roadway design. More crashes tend to occur
on curved sections than on tangent sections. Factors influencing safety concerns on
curves, such as design speed and, embankment angles, were investigated through
mathematical models based on the design guidelines currently used in South Africa and
the Green Book. The effect of gradient did not affect the maximum travel speed that can
be obtained on a specific radius with an applied superelevation rate. Minimum radii were
found to pose the highest risk, and it is recommended to impose desirable minimum limits
rather than relying on theoretical minimum values to mitigate these risks.
