The feature of VANET mostly resembles the operation technology of MANET in the sense that

the process of self-organization, self-management, low bandwidth and shared radio

transmission criteria remain same. But the key hindrance in operation of VANET comes from the

high speed and uncertain mobility [in contrast to MANET] of the mobile nodes (vehicles) along

the paths. This suggested that the design of efficient routing protocol demands upgradation of

MANET architecture to accommodate the fast mobility of the VANET nodes in an efficient

manner. This warranted various research challenges to design appropriate routing protocol. It is

therefore important at this stage to reiterate the key characteristics of VANET that may be

accounted for the design of various routing protocols.