This project intends to create a file format or data structure to accommodate transportation and traffic engineering needs. This project does not conflict with PgRouting as the aim is not to create routing and network analysis plugin, rather it will be a base road/network file format. Although a little bit old, the paper by Miller and Shaw  is an excellent paper outlining transportation basics for GIS. I have all the manuals and technical background to perform the above analysis and could easily be provided upon request. These are some of the challenges in open source GIS with respect to transportation and traffic engineering. There are many more and I will be more than happy to expand this into a full pledged paper. This project intends to create a plugin and a set of classes to make the translation between raster formats more friendly using gdal. The main products of this work can be: Source.