A complex road topology in a large city environment have become one of the most challenging factors in vehicular communications. Besides inevitable overpass and building constructions, road topologies with a nonstraight structure, i.e., curvy- and circle-shaped road topologies, will lead to particular investigations and evaluations. This paper addresses the challenge of a threedimensional road topology in Jakarta, Indonesia, and investigates the possibility to design vehicular communication efficiently with a three-dimensional environmental awareness approach. The main work performed here is to evaluate the previously proposed approach Vehicular-to vehicular Urban Network (V2VUNet) for complex threedimensional road topologies. This enhancement takes into account the combination of (a) the area restriction scheme and (b) predictive forwarding scheme. The simulation shows that supplication of the enhanced V2VUNet compared to the traditional three-dimensional forwarding scheme leads to 20% better network performance in a such road topologies.