Los Alamos National Laboratory makes the TRANSIMS software available to academic institutions for a small charge.
The Swiss Federal Administration provides the input data for the Switzerland studies.
I thank my collaborators N. Cetin and B. Raney for providing valuable input and their most recent results, and we all thank our collegues at the Insitute for Transportation, Traffic, Highway- and Railway- Engineering, in particular K. Axhausen and M. Vrtic, for considerable help with the ``real world'' aspects of the Switzerland project.