Radius and Superelevation
•But is the cross-slope of the roadway, which is the same
as the superelevation rate . Consequently,
•or
•In geometric design, the term is often ignored as it is
generally very close to zero for practical values of and .
So, the relationship can be simplified to
•Also,
•A commonly used mixed-unit version of this equation is
•where, is in km/h and is in meters