Andrzej Kobryń is a lecturer and associate professor at the Department of Geoinformation and Spatial Development, Bialystok University of Technology, Poland. The main scope of his interest is the formation of transition curves and highway geometric design, which is the subject of his research.

• Introduction.- Simple horizontal and vertical curves.-  Mathematical methods for defining of transition curves.- Transition curves described using curvature function.- Transition curves described using explicit function.- Transition curves defined in the polar coordinate system.- Polynomial description of transition curves.- Sample applications of transition curves in horizontal alignment.- Sample applications of transition curves in vertical alignment.