The segment map is normally constructed from an axial map. Axial lines are broken at their intersections. An alternative method takes the road centrelines from a pre-drawn transport network and simplifies and cleans it up to reduce over-articulated curves and to remove extraneous road traffic features.
Segment map
Sources
Turner, A. (2004), DepthMap4: A Researcher’s Handbook, UCL. pp.26-27