A Vehicular Ad hoc NETwork (VANET) is also known as a vehicular sensor network by which driving safety is enhanced through inter-vehicle communications or communications with base station. Vehicular Ad-hoc NETwork (VANET) is different from all other form of ad hoc network because of its hybrid nature and node movement i.e. high mobility of VANET. Design of an efficient routing protocol for VANETs is very crucial. Therefore, in this paper, the authors discuss the routing protocols and implementation of DSP algorithm in VANET.