For the German State of Saxony Agency of Environment, Geology and Agriculture, the non-exhaust-pipe vehicle air pollution emission factors (abrasion and re-suspension) were adapted to HBEFA3.1 and recent results of field measurements.
For the final report (in German) see http://www.umwelt.sachsen.de/umwelt/download/70675_09_10_Endfassung.pdf.