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The vehicular ad hoc networks (VANETs) have envisaged many researchers to work in this field as VANETs are capable of providing efficient data dissemination. The efficiency of the network can be increased by considering many such parameters which are typically not considered during the analysis of the network (like obstacles). In the proposed protocol, vehicles are considered as three-dimensional objects having significant size which further helps to find total area affected due to presence of obstacles. This paper is a motivation to increase the level of realism by considering all vehicles moving on road as a sizable object. A realistic model should consider impact of obstacles on vehicular communication. During modeling a system should have realistic mobility, channel selection and tolerable overhead. Our result shows that how the distance between vehicles badly affected system performance. We …