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Vehicular communications have a wide range of applications and are quickly growing in last years. In our work, we investigate vehicular communications to improve the Vehicle-to-infrastructure (V2I) link and enhance the performance of the entire network. We consider a microcellular urban network and compare the coverage probability of the V2I link to the relay-assisted link. We deploy a Manhattan grid where the streets are deployed according to a Poisson line process (PLP), and microcell base stations (BSs) and vehicular users are placed according to a Poisson point process (PPP). We analyze the relay position that maximizes the coverage improvement depending on the density of streets, BSs and vehicular users. We derive analytical expressions for the coverage probability of both direct and relay-assisted links by exploiting tools from stochastic geometry and perform Monte Carlo system level simulations of …