From Christoph Sommer: We’ve now prepared and uploaded the codebase of our “Computationally Inexpensive Empirical Model of IEEE 802.11p Radio Shadowing in Urban Environments” for public consumption. The obstacle model lives at http://www7.informatik.uni-erlangen.de/~sommer/omnet/obstacles/, and can be downloaded for both the INET Framework and for MiXiM. The code is GPL-licensed, so feel free to integrate it with any compatible framework. An in-depth documentation of the model, as well as the results of extensive experiments we performed using IEEE 802.11p radios mounted in cars can be found in the Technical Report of the same name, published at http://www7.informatik.uni-erlangen.de/~dressler/bib/inc/sommer2010computationally-abstract.shtml. If you have any questions, don’t hesitate to get back to me!