File description:

1) generate_random_sOC_parameters randomly generates the distributions for the sOC parameters of the road models
   (i.e., the "simple variables" of the paper [1]). It also generates the distributions for the composite
   variables used by the GTA and UFD classification systems. All the variables are saved

2) distributionsPDF computes the PMFs for the GTA and UFD systems, starting from the output of 
   generate_random_sOC_parameters. The considered combinations, after marginalising over the other dimensions,
   are road grade/mission length, legal speed/mission length, and curviness/mission length.

3) assemble_sOC randomly generates a population of sOCs starting from the output of generate_random_sOC_parameters.
   It also assembles the mean representative sOC, parametrised in terms of mean sOC parameters.

4) generate_dOCs randomly generates a population of dOCs starting from an sOC, and saves them to the folder
   "generated_dOCs". It uses the function generate_dOC_Road.