Wow....
There are lots of studies of the use of generic mathematical modelling in project management but you're taking this a step further by actually making a comparative study of the methodology of creating the most economic model of modelling, either by taking projects individually one at a time or by combining them into a group, program and modelling the relationships? ......removing the specifics of road management, I'd never even of imagined anything like this, let alone known anyone who would! Was this a specific remit or was the whole idea to examine this, yours? I just hope you were well paid, but I sense a little despondency that others didn't share your interest or enthusiasm which is understandable after you put in so much work and passion.

When I was googling to follow up and understand some of your paper, I found this paper which you may find interesting and was also an interesting read to complement what I'd learned from you.
https://pmworldlibrary.net/wp-content/uploads/2013/01/PMWJ3-Oct2012-VOROPAJEV-GELRUD-MathematicalModels-ProjectManagement-Featured-Paper.pdf

Have a great weekend.....and a beer or two. And thank you as always for contributing and sharing so much knowledge. It really is appreciated :-)