  A comprehensive implementation of the envisioned traffic safety and
efficiency applications of the IEEE 802.11p and WAVE standards assume the
premise of the use of DSRC technology both as on-board units (OBUs) and as
Roadside Units (RSUs). The high cost associated with RSUs, however, has so far
prevented massive deployment of RSUs. Finding alternative solutions to this
longstanding problem is therefore very important. In this paper, we propose a
self-organizing network approach to using parked cars in urban areas as RSUs.
This self-organizing network approach enables parked cars to create coverage
maps based on received signal strength and make important decisions, such as if
and when a parked car should serve as an RSU. Our results show the feasibility
and cost-effectiveness of the proposed approach, which is able to provide
excellent coverage using only a small fraction of the cars parked in a city.
