  We develop an analytical framework to examine the line-of-sight (LOS)
coverage area in vehicular networks with roadside units (RSU) and vehicle
relays. In practical deployment scenarios, RSUs and vehicle relays are
spatially correlated and we characterize this by employing Cox point processes
to model the locations of RSUs and vehicle relays simultaneously. Leveraging
the random blockage model, we model the LOS coverage area as Boolean models on
these Cox point processes. The LOS coverage area is then evaluated by its area
fraction. We show that relays can increase the area fraction of LOS coverage by
nearly 50\% even when RSUs and relays are spatially correlated. By presenting a
stochastic geometry model for a vehicular network with RSUs and relays and then
by providing a tool to capture its LOS coverage, our work assesses the
viability of vehicle relays for modern vehicular networks exploiting LOS
coverage.
