It re-routes you around stopped traffic and jams.
Does the built in Hyundai Sat Nav not do that as well? My BMW did but I haven’t hit any major traffic problems in the Hyundai yet to know. One thing that impressed me with the Hyundai system the other day, that my BMW didn’t do, is that when in an ‘average speed camera zone’ it displays a running average speed that you’ve travelled at within the zone from when you entered it until you finally leave. Clever stuff.