The Tra?c and Granular Flow 07 conference was the seventh of a series of international conferences that started in 1995 in Julic ] h (Germany). Since then, the conference took place in Duisburg (1997), Stuttgart (1999), Nagoya (2001), Delft (2003) and Berlin (2005). The aim of TGF conferences is to facilitate the exchanges between various ?elds dealing with transport. When the conference was created, the ?elds that were represented were road tra?c and granular ?ow hence the name of the series. Since then, the scope of the conference has been enlarged to include in particular collective motion...