  V2X communications are nowadays performed at 5.9\,GHz spectrum, either using
WiFi-based or Cellular technology. The channel capacity is limited, and
congestion control regulates the number of messages that can enter the medium.
With user rate growing, overloading becomes a factor that might affect road
safety and traffic efficiency. The present paper evaluates the potential of
using Radar-Based Communication (RadCom) for offloading the V2X spectrum. We
consider a heavy-duty vehicle (HDV) platooning scenario as a case of maneuver
coordination where local messages are transmitted by means of RadCom at
different penetration rates. Simulations show significant improvements in
channel occupation and network reliability. As a result, RadCom allows for
shorter safe and energy efficient inter-vehicle distances.
