@all ... thanks for the encouragement
@Dune ... I would love to have a good idea for convincing procedural asphalt ,-)
@j meyer ... well, I learned a lot by the functions you supplied. So the applied TGD is for your eyes only ,-)
(attached a very simple scene with a distribution example. Other than the above clip: There are no internal networks and I killed the Y-axis part, as it rather complicates the distribution)