Vehicle navigation systems, methods, and programs, receive traffic
information. The systems, methods, and programs determine whether there
is a controlled road link within a predetermined distance of the vehicle
and determine whether there is congestion information that begins with
the controlled road link based on the received traffic information. The
systems, methods, and programs provide, if the congestion information
indicates that traffic congestion begins at the controlled link, guidance
including traffic congestion guidance, the traffic congestion guidance
indicating that the traffic congestion begins at the controlled road
link.