1. A method comprising: determining a plurality of break-point locations along an analytical curve that represents a portion of a road network, wherein determining the plurality of break-point locations comprises determining a curvature profile defining a curvature of the analytical curve at a respective arc length by approximating the curvature profile of a curve with a plurality of polylines, identifying one or more zero-crossings in the curvature profile so as to define curves therebetween and determining the plurality of break-point locations dependent upon vertices and the zero crossings of the plurality of polylines that approximate the curvature profile of the analytical curve so as to define one or more sections of the analytical curve based upon the break-point locations; converting one or more sections of the analytical curve to respective clothoids; and using the respective clothoids by a map display or to support an advanced driver assistance system (ADAS).