Figure 6
This geometric diagram shows a single rectangular region divided by a central red horizontal line. The vertical dimension is labeled h, representing the lateral extension (30 km) from the railway line. The upper and lower sides are marked a₁ and a₂, indicating the narrow and wide edges of the trapezoidal design adopted later for overlapping configuration. Points A and B are annotated to mark reference stations at both ends. The figure provides a clear definition of the dimensional variables used in PLUM-zone construction.Geometry of warning-region parameters. Source(s): Authors’ own work