Reports of traction-altering events between vehicle systems and surfaces of routes being traveled upon by the vehicle systems are received, and one or more areas of interest associated with increased likelihood of one or more additional traction-altering events are identified based on the reports that are received. Signals are communicated to one or more other vehicle systems to one or more of warn the one or more other vehicle systems of the traction-altering events or control movement of the one or more other vehicle systems to avoid the one or more additional traction-altering events.