Date Added: Sep 2012
VANETs (Vehicular Ad hoc NETworks) are upcoming wireless network environment for Intelligent Transportation Systems (ITS). Most VANET applications are built upon the data push communication model, where information is disseminated to a set of vehicles. The diversity of the VANET applications and their potential communication protocols needs a systematic literature survey. In this paper VANET characteristics and challenges are discussed. Application based various broadcasting data dissemination protocols are surveyed separately and their fundamental characteristics are revealed. In the end a tabular comparison of all the protocols is given.