  Vehicular Ad hoc Network (VANET) is a new sort of wireless ad-hoc network.
Vehicle-to-Vehicle (V2V) communication is one of the main communication
paradigms that provide a level of safety and convenience to drivers and
passengers on the road. In such an environment, routing data packets is
challenging due to frequent changes of network topology because of the highly
dynamic nature of vehicles. Thus, routing in VANETs requires efficient
protocols that guarantee message transmission among vehicles. Numerous routing
protocols and algorithms have been proposed or enhanced to solve the
aforementioned problems. Many position-based routing protocols have been
developed for routing messages that have been identified to be appropriate for
VANETs. This work explores the performances of selected unicast non-delay
tolerant overlay position-based routing protocols. The evaluation has been
conducted in highway and urban environments in two different scenarios. The
evaluation metrics that are used are Packet Delivery Ratio (PDR), Void Problem
Occurrence (VPO), and Average Hop Count (AHC).
